feat(im): Add user-owned IM channel connections (#3487)

* Add user-owned IM channel connections

* Fix dev startup and channel connect popup

* Use async channel connect flow

* Harden dev service daemon startup

* Support local IM channel connections

* Align IM connections with local channels

* Fix safe user id digest algorithm

* Address Copilot IM channel feedback

* Address IM channel review comments

* Support all integrated IM channel connections

* Format additional channel connection tests

* Keep unavailable channel connect buttons clickable

* Fix IM channel provider icons

* Add runtime setup for enabled IM channels

* Guard global shortcut key handling

* Keep configured IM channels editable

* Avoid password autofill for channel secrets

* Make channel threads visible to connection owners

* Persist IM runtime config locally

* Allow disconnecting runtime IM channels

* Route no-auth channel sessions to local user

* Use default user for auth-disabled local mode

* Show IM channel source on threads

* Prefill IM channel runtime config

* Reflect IM channel runtime health

* Ignore Feishu message read events

* Ignore Feishu non-content message events

* Let setup wizard enable IM channels

* Fix frontend formatting after merge

* Stabilize backend tests without local config

* Isolate channel runtime config tests

* Address channel connection review comments

* Use sha256 user buckets with legacy migration

* Ensure runtime IM channels are ready after restart

* Persist disconnected IM channel state

* Address channel connection review comments

* Address channel connection review findings

Frontend connect flow:
- Open the runtime-config dialog only when a provider still needs
  credentials; configured providers go straight to the connect flow, so
  the binding-code/deep-link path is reachable from the UI again.
- After saving credentials, continue into the connect flow when a user
  binding is still required (multi-user mode) instead of stopping at a
  "Connected" toast.
- Extract shared provider-state helpers to core/channels/provider-state
  and add unit + e2e coverage for the direct-connect and
  configure-then-connect paths.

Provider status semantics:
- Report connection_status from the user's newest connection row;
  with no binding it is not_connected, except in auth-disabled local
  mode where a configured running channel is effectively connected.

Concurrency and event-loop correctness:
- Offload ChannelRuntimeConfigStore construction and writes, channel
  service construction, and Slack connection replies to threads; add a
  tests/blocking_io/ anchor for the runtime-config handlers.
- Consume binding codes with a conditional UPDATE so a code can only be
  used once under concurrent workers; retry upsert_connection as an
  update when a concurrent insert wins the unique constraint.
- Serialize ensure_channel_ready per channel so concurrent provider
  polls cannot double-start a channel worker.

Config and migration hardening:
- Stop mutating the get_app_config()-cached Telegram provider config;
  the runtime store now owns the UI-entered bot username.
- Register channel_connections in STARTUP_ONLY_FIELDS with the
  standardized startup-only Field description.
- Match the legacy unsafe-id bucket by recomputing its exact SHA-1 name
  so another user's same-prefix bucket can never be migrated.
- Remove the unused Telegram process_webhook_update path and document
  src/core/channels in the frontend docs.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Address PR review comments on authz scoping and channel runtime

Security (review feedback from ShenAC-SAC):
- Scope internal-token callers to the connection owner carried in
  X-DeerFlow-Owner-User-Id instead of bypassing owner checks outright,
  in both require_permission(owner_check=True) and the stateless run
  endpoints. Internal callers keep access to their own and
  shared/legacy threads, and may claim a default-owned channel thread
  for its real owner, but a leaked internal token no longer grants
  cross-user thread access.
- Require admin privileges for POST/DELETE /api/channels/{provider}/
  runtime-config: runtime credentials and channel workers are
  instance-wide shared state (same model as the MCP config API).
  Read-only provider listing stays available to all users.

Performance (review feedback from willem-bd):
- Skip the redundant thread channel-metadata PATCH after the first
  successful backfill per thread.
- Reuse the per-connection Slack WebClient until its token changes
  instead of constructing one per outbound message.
- Reconcile channel readiness for all providers concurrently in
  GET /api/channels/providers.

Also resolve the code-quality unused-import flag in the blocking-io
anchor by pre-importing the channel service via importlib.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Fix prettier formatting in provider-state test

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Reconcile UI runtime channel config with config reload on restart

Main now reloads a channel's config.yaml entry on restart_channel()
(#3514, issue #3497). Adapt the user-owned connection flow to coexist:

- configure_channel() restarts with reload_config=False — the caller
  just supplied the authoritative config (browser-entered credentials
  that are never written to config.yaml), so a file reload must not
  clobber it with the stale on-disk entry.
- _load_channel_config() re-applies the UI runtime-store overlay used
  at startup, so an operator-triggered restart keeps browser-entered
  credentials for channels without a config.yaml entry and does not
  resurrect a channel disconnected from the UI.
- Offload the reload's disk IO (config.yaml + runtime store) with
  asyncio.to_thread, matching the blocking-IO policy on this branch.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

backend/tests/test_setup_wizard.py

@@ -7,7 +7,9 @@ Run from repo root:
 from __future__ import annotations
 
 import yaml
+from wizard import ui as wizard_ui
 from wizard.providers import LLM_PROVIDERS, SEARCH_PROVIDERS, WEB_FETCH_PROVIDERS, LLMProvider
+from wizard.steps import channels as channels_step
 from wizard.steps import llm as llm_step
 from wizard.steps import search as search_step
 from wizard.writer import (
@@ -327,6 +329,44 @@ class TestBuildMinimalConfig:
         assert model["when_thinking_enabled"]["extra_body"]["thinking"]["type"] == "enabled"
         assert model["when_thinking_disabled"]["extra_body"]["thinking"]["type"] == "disabled"
 
+    def test_can_enable_selected_channel_connections(self):
+        content = build_minimal_config(
+            provider_use="langchain_openai:ChatOpenAI",
+            model_name="gpt-4o",
+            display_name="OpenAI",
+            api_key_field="api_key",
+            env_var="OPENAI_API_KEY",
+            channel_connection_providers=["feishu", "slack"],
+        )
+
+        data = yaml.safe_load(content)
+        channel_connections = data["channel_connections"]
+
+        assert channel_connections["enabled"] is True
+        assert channel_connections["feishu"]["enabled"] is True
+        assert channel_connections["slack"]["enabled"] is True
+        assert channel_connections["telegram"]["enabled"] is False
+        assert channel_connections["discord"]["enabled"] is False
+        assert channel_connections["dingtalk"]["enabled"] is False
+        assert channel_connections["wechat"]["enabled"] is False
+        assert channel_connections["wecom"]["enabled"] is False
+
+    def test_channel_connections_disabled_when_no_channels_selected(self):
+        content = build_minimal_config(
+            provider_use="langchain_openai:ChatOpenAI",
+            model_name="gpt-4o",
+            display_name="OpenAI",
+            api_key_field="api_key",
+            env_var="OPENAI_API_KEY",
+            channel_connection_providers=[],
+        )
+
+        data = yaml.safe_load(content)
+        channel_connections = data["channel_connections"]
+
+        assert channel_connections["enabled"] is False
+        assert all(not config["enabled"] for provider, config in channel_connections.items() if provider != "enabled")
+
 
 class TestLLMStep:
     def test_model_selection_defaults_to_provider_default_model(self, monkeypatch):
@@ -384,6 +424,41 @@ class TestLLMStep:
         assert result.base_url == "https://gateway.example/v1"
 
 
+class TestChannelsStep:
+    def test_returns_selected_channel_keys(self, monkeypatch):
+        monkeypatch.setattr(channels_step, "print_header", lambda *_args, **_kwargs: None)
+        monkeypatch.setattr(channels_step, "print_info", lambda *_args, **_kwargs: None)
+        monkeypatch.setattr(channels_step, "print_success", lambda *_args, **_kwargs: None)
+        monkeypatch.setattr(channels_step, "ask_multi_choice", lambda *_args, **_kwargs: [0, 3, 6])
+
+        result = channels_step.run_channels_step()
+
+        assert result.enabled_providers == ["telegram", "feishu", "wecom"]
+
+    def test_empty_selection_disables_channel_connections(self, monkeypatch):
+        monkeypatch.setattr(channels_step, "print_header", lambda *_args, **_kwargs: None)
+        monkeypatch.setattr(channels_step, "print_info", lambda *_args, **_kwargs: None)
+        monkeypatch.setattr(channels_step, "print_success", lambda *_args, **_kwargs: None)
+        monkeypatch.setattr(channels_step, "ask_multi_choice", lambda *_args, **_kwargs: [])
+
+        result = channels_step.run_channels_step()
+
+        assert result.enabled_providers == []
+
+
+class TestWizardUi:
+    def test_multi_choice_blank_requires_input_without_default(self, monkeypatch):
+        answers = iter(["", "2"])
+        monkeypatch.setattr("builtins.input", lambda _prompt: next(answers))
+
+        assert wizard_ui.ask_multi_choice("Pick", ["First", "Second"], default=None) == [1]
+
+    def test_multi_choice_blank_accepts_empty_default(self, monkeypatch):
+        monkeypatch.setattr("builtins.input", lambda _prompt: "")
+
+        assert wizard_ui.ask_multi_choice("Pick", ["First", "Second"], default=[]) == []
+
+
 # ---------------------------------------------------------------------------
 # writer.py — env file helpers
 # ---------------------------------------------------------------------------