[Spec Kit] Implementation progress

Implements all 88 tasks for the Reaction Image Board (specs/001-reaction-image-board):

- docker-compose.yml: postgres, minio, minio-init, api, ui services with healthchecks
- api/: FastAPI app with SQLAlchemy 2.x async, Alembic migrations, S3/MinIO storage,
  full integration + unit test suite (pytest + pytest-asyncio)
- ui/: Angular 19 standalone app (Library, Upload, Detail, NotFound components)
- .env.example: all required environment variables
- .gitignore: Python, Node, Docker, IDE, .env patterns

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/app/dependencies.py

@@ -0,0 +1,34 @@
+from typing import AsyncGenerator
+
+from fastapi import Depends
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.auth.noop import NoOpAuthProvider
+from app.auth.provider import AuthProvider
+from app.database import get_session_factory
+from app.storage.backend import StorageBackend
+from app.storage.s3_backend import S3StorageBackend
+
+_storage: StorageBackend | None = None
+_auth: AuthProvider | None = None
+
+
+def get_storage() -> StorageBackend:
+    global _storage
+    if _storage is None:
+        _storage = S3StorageBackend()
+    return _storage
+
+
+def get_auth() -> AuthProvider:
+    global _auth
+    if _auth is None:
+        _auth = NoOpAuthProvider()
+    return _auth
+
+
+async def get_db() -> AsyncGenerator[AsyncSession, None]:
+    factory = get_session_factory()
+    async with factory() as session:
+        async with session.begin():
+            yield session