Implement Valkey caching layer and update related configurations

- Add CacheClient for managing Valkey interactions
- Integrate caching into bus API routes for improved performance
- Update .env.example and config.py for Valkey settings
- Modify Makefile and README for Valkey service management
- Add Valkey service to docker-compose
- Include Valkey dependency in pyproject.toml and uv.lock

uv.lock

@@ -173,6 +173,7 @@ dependencies = [
     { name = "pydantic" },
     { name = "pydantic-settings" },
     { name = "uvicorn", extra = ["standard"] },
+    { name = "valkey" },
 ]
 
 [package.metadata]
@@ -183,6 +184,7 @@ requires-dist = [
     { name = "pydantic", specifier = "==2.11.7" },
     { name = "pydantic-settings", specifier = "==2.10.1" },
     { name = "uvicorn", extras = ["standard"], specifier = "==0.35.0" },
+    { name = "valkey", specifier = "==6.1.0" },
 ]
 
 [[package]]
@@ -410,6 +412,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/e4/16/c1fd27e9549f3c4baf1dc9c20c456cd2f822dbf8de9f463824b0c0357e06/uvloop-0.22.1-cp314-cp314t-musllinux_1_2_x86_64.whl", hash = "sha256:6cde23eeda1a25c75b2e07d39970f3374105d5eafbaab2a4482be82f272d5a5e", size = 4296730, upload-time = "2025-10-16T22:17:00.744Z" },
 ]
 
+[[package]]
+name = "valkey"
+version = "6.1.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/38/d4/04b6a234e584e21ccb63b895ca9dfb4e759e4c139c1ab3f9484982ee6491/valkey-6.1.0.tar.gz", hash = "sha256:a652df15ed89c41935ffae6dfd09c56f4a9ab80b592e5ed9204d538e2ddad6d3", size = 4600944, upload-time = "2025-02-11T17:20:46.706Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/79/b0/c4d47032bbda89cff7af99c0b096db9b9453b9f0c1e24cf027aa616be389/valkey-6.1.0-py3-none-any.whl", hash = "sha256:cfe769edae894f74ac946eff1e93f7d7f466032c3030ba7e9d089a742459ac9c", size = 259302, upload-time = "2025-02-11T17:20:42.96Z" },
+]
+
 [[package]]
 name = "watchfiles"
 version = "1.2.0"