refactor(config): eliminate global mutable state, wire DeerFlowContext into runtime

- Freeze all config models (AppConfig + 15 sub-configs) with frozen=True
- Purify from_file() — remove 9 load_*_from_dict() side-effect calls
- Replace mtime/reload/push/pop machinery with single ContextVar + init_app_config()
- Delete 10 sub-module globals and their getters/setters/loaders
- Migrate 50+ consumers from get_*_config() to get_app_config().xxx

- Expand DeerFlowContext: app_config + thread_id + agent_name (frozen dataclass)
- Wire into Gateway runtime (worker.py) and DeerFlowClient via context= parameter
- Remove sandbox_id from runtime.context — flows through ThreadState.sandbox only
- Middleware/tools access runtime.context directly via Runtime[DeerFlowContext] generic
- resolve_context() retained at server entry points for LangGraph Server fallback

backend/packages/harness/deerflow/runtime/store/async_provider.py

@@ -23,7 +23,7 @@ from collections.abc import AsyncIterator
 
 from langgraph.store.base import BaseStore
 
-from deerflow.config.app_config import get_app_config
+from deerflow.config.app_config import AppConfig
 from deerflow.runtime.store.provider import POSTGRES_CONN_REQUIRED, POSTGRES_STORE_INSTALL, SQLITE_STORE_INSTALL, ensure_sqlite_parent_dir, resolve_sqlite_conn_str
 
 logger = logging.getLogger(__name__)
@@ -100,7 +100,7 @@ async def make_store() -> AsyncIterator[BaseStore]:
     Yields an :class:`~langgraph.store.memory.InMemoryStore` when no
     ``checkpointer`` section is configured (emits a WARNING in that case).
     """
-    config = get_app_config()
+    config = AppConfig.current()
 
     if config.checkpointer is None:
         from langgraph.store.memory import InMemoryStore

backend/packages/harness/deerflow/runtime/store/provider.py

@@ -26,7 +26,7 @@ from collections.abc import Iterator
 
 from langgraph.store.base import BaseStore
 
-from deerflow.config.app_config import get_app_config
+from deerflow.config.app_config import AppConfig
 from deerflow.runtime.store._sqlite_utils import ensure_sqlite_parent_dir, resolve_sqlite_conn_str
 
 logger = logging.getLogger(__name__)
@@ -115,19 +115,10 @@ def get_store() -> BaseStore:
     if _store is not None:
         return _store
 
-    # Lazily load app config, mirroring the checkpointer singleton pattern so
-    # that tests that set the global checkpointer config explicitly remain isolated.
-    from deerflow.config.app_config import _app_config
-    from deerflow.config.checkpointer_config import get_checkpointer_config
-
-    config = get_checkpointer_config()
-
-    if config is None and _app_config is None:
-        try:
-            get_app_config()
-        except FileNotFoundError:
-            pass
-        config = get_checkpointer_config()
+    try:
+        config = AppConfig.current().checkpointer
+    except (LookupError, FileNotFoundError):
+        config = None
 
     if config is None:
         from langgraph.store.memory import InMemoryStore
@@ -176,7 +167,7 @@ def store_context() -> Iterator[BaseStore]:
     Yields an :class:`~langgraph.store.memory.InMemoryStore` when no
     checkpointer is configured in *config.yaml*.
     """
-    config = get_app_config()
+    config = AppConfig.current()
     if config.checkpointer is None:
         from langgraph.store.memory import InMemoryStore