chore: restructure project directory and update Dockerfile paths

app/core/redis.py

@@ -0,0 +1,22 @@
+import redis.asyncio as aioredis
+
+from core.config import settings
+
+_redis_pool: aioredis.Redis | None = None
+
+async def init_redis() -> None:
+    global _redis_pool
+    _redis_pool = aioredis.from_url(
+        settings.REDIS_URL, encoding="utf-8", decode_responses=True
+    )
+
+
+async def close_redis() -> None:
+    if _redis_pool:
+        await _redis_pool.aclose()
+
+
+async def get_redis() -> aioredis.Redis:
+    if _redis_pool is None:
+        raise RuntimeError("Redis pool has not been initialized")
+    return _redis_pool