refactor: Remove deprecation middleware and metrics

Remove deprecation tracking middleware and metrics endpoints as they are
not needed for internal API. This simplifies the codebase and removes
unnecessary complexity.

Changes:
- Remove DeprecationMiddleware and DeprecationMetrics from app.py
- Remove /management/deprecation-info endpoint
- Remove /management/metrics/deprecation endpoint
- Clean up imports in app.py

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Joe P <joe@basicmemory.com>

Author: jope-bm

src/basic_memory/api/app.py

@@ -27,7 +27,6 @@
     search_router as v2_search,
     resource_router as v2_resource,
 )
-from basic_memory.api.middleware import DeprecationMiddleware, DeprecationMetrics
 from basic_memory.config import ConfigManager
 from basic_memory.services.initialization import initialize_file_sync, initialize_app
 
@@ -74,20 +73,7 @@ async def lifespan(app: FastAPI):  # pragma: no cover
     lifespan=lifespan,
 )
 
-# Initialize deprecation metrics for tracking v1/v2 adoption
-deprecation_metrics = DeprecationMetrics()
-app.state.deprecation_metrics = deprecation_metrics
-
-# Add deprecation middleware for v1 endpoints
-# Sunset date: June 30, 2026 (6 months after v2 release)
-app.add_middleware(
-    DeprecationMiddleware,
-    sunset_date="Tue, 30 Jun 2026 23:59:59 GMT",
-    metrics=deprecation_metrics,
-)
-
-
-# Include v1 routers (deprecated)
+# Include v1 routers
 app.include_router(knowledge.router, prefix="/{project}")
 app.include_router(memory.router, prefix="/{project}")
 app.include_router(resource.router, prefix="/{project}")

src/basic_memory/api/routers/management_router.py

@@ -78,56 +78,3 @@ async def stop_watch_service(request: Request) -> WatchStatusResponse:  # pragma
 
     request.app.state.watch_task = None
     return WatchStatusResponse(running=False)
-
-
-@router.get("/deprecation-info")
-async def get_deprecation_info() -> dict:
-    """Get information about deprecated API versions.
-
-    Returns deprecation timeline, migration guides, and sunset dates.
-    This endpoint helps clients understand the API migration path from v1 to v2.
-    """
-    return {
-        "v1": {
-            "status": "deprecated",
-            "sunset_date": "2026-06-30T23:59:59Z",
-            "sunset_date_http": "Tue, 30 Jun 2026 23:59:59 GMT",
-            "successor": "v2",
-            "migration_guide": "docs/migration/v1-to-v2.md",
-            "breaking_changes": [
-                "Entity identifiers changed from paths to integer IDs",
-                "URL structure changed from /{project}/endpoint to /v2/{project}/endpoint",
-                "Memory URLs now support memory://id/{entity_id} format",
-                "Direct ID lookups replace cascading identifier resolution",
-            ],
-            "affected_endpoints": [
-                "/{project}/knowledge/entities/{identifier:path}",
-                "/{project}/memory/{uri:path}",
-                "/{project}/search/*",
-                "/{project}/resource/*",
-                "/{project}/directory/*",
-            ],
-        },
-        "v2": {
-            "status": "stable",
-            "release_date": "2025-01-01T00:00:00Z",
-            "base_url": "/v2/{project}",
-            "documentation": "https://docs.basic-memory.io/api/v2",
-            "key_features": [
-                "ID-based entity references for improved performance",
-                "Stable identifiers that don't change with file moves",
-                "Better caching support",
-                "Identifier resolution endpoint for migration compatibility",
-            ],
-        },
-    }
-
-
-@router.get("/metrics/deprecation")
-async def get_deprecation_metrics(request: Request) -> dict:
-    """Get v1 API deprecation metrics.
-
-    Returns usage statistics for v1 and v2 endpoints to help monitor
-    the migration progress.
-    """
-    return request.app.state.deprecation_metrics.get_stats()