feat: implement Redis caching for analytics endpoints with fallback to database

app/api/deps.py

@@ -6,6 +6,7 @@ from fastapi import Depends, Header, HTTPException, status
 from fastapi.security import OAuth2PasswordBearer
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from app.core.cache import get_cache_client
 from app.core.config import settings
 from app.core.database import get_session
 from app.core.security import jwt_service, password_hasher
@@ -29,6 +30,7 @@ from app.services.organization_service import (
     OrganizationService,
 )
 from app.services.task_service import TaskService
+from redis.asyncio.client import Redis
 
 oauth2_scheme = OAuth2PasswordBearer(tokenUrl=f"{settings.api_v1_prefix}/auth/token")
 
@@ -67,8 +69,19 @@ def get_analytics_repository(session: AsyncSession = Depends(get_db_session)) ->
     return AnalyticsRepository(session=session)
 
 
-def get_deal_service(repo: DealRepository = Depends(get_deal_repository)) -> DealService:
-    return DealService(repository=repo)
+def get_cache_backend() -> Redis | None:
+    return get_cache_client()
+
+
+def get_deal_service(
+    repo: DealRepository = Depends(get_deal_repository),
+    cache: Redis | None = Depends(get_cache_backend),
+) -> DealService:
+    return DealService(
+        repository=repo,
+        cache=cache,
+        cache_backoff_ms=settings.analytics_cache_backoff_ms,
+    )
 
 
 def get_auth_service(
@@ -95,8 +108,14 @@ def get_activity_service(
 
 def get_analytics_service(
     repo: AnalyticsRepository = Depends(get_analytics_repository),
+    cache: Redis | None = Depends(get_cache_backend),
 ) -> AnalyticsService:
-    return AnalyticsService(repository=repo)
+    return AnalyticsService(
+        repository=repo,
+        cache=cache,
+        ttl_seconds=settings.analytics_cache_ttl_seconds,
+        backoff_ms=settings.analytics_cache_backoff_ms,
+    )
 
 
 def get_contact_service(