[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/tests/unit/test_config.py

@@ -0,0 +1,40 @@
+import os
+import pytest
+
+
+def test_settings_load_from_env(monkeypatch):
+    monkeypatch.setenv("DATABASE_URL", "postgresql+asyncpg://u:p@localhost/db")
+    monkeypatch.setenv("S3_ENDPOINT_URL", "http://localhost:9000")
+    monkeypatch.setenv("S3_BUCKET_NAME", "test-bucket")
+    monkeypatch.setenv("S3_ACCESS_KEY_ID", "key")
+    monkeypatch.setenv("S3_SECRET_ACCESS_KEY", "secret")
+    monkeypatch.setenv("S3_REGION", "us-east-1")
+    monkeypatch.setenv("API_BASE_URL", "http://localhost:8000")
+
+    # Import inside test to pick up monkeypatched env
+    import importlib
+    import app.config as config_module
+    importlib.reload(config_module)
+
+    s = config_module.Settings()
+    assert s.database_url == "postgresql+asyncpg://u:p@localhost/db"
+    assert s.s3_bucket_name == "test-bucket"
+    assert s.max_upload_bytes == 52428800  # default
+
+
+def test_settings_max_upload_bytes_override(monkeypatch):
+    monkeypatch.setenv("DATABASE_URL", "postgresql+asyncpg://u:p@localhost/db")
+    monkeypatch.setenv("S3_ENDPOINT_URL", "http://localhost:9000")
+    monkeypatch.setenv("S3_BUCKET_NAME", "test-bucket")
+    monkeypatch.setenv("S3_ACCESS_KEY_ID", "key")
+    monkeypatch.setenv("S3_SECRET_ACCESS_KEY", "secret")
+    monkeypatch.setenv("S3_REGION", "us-east-1")
+    monkeypatch.setenv("API_BASE_URL", "http://localhost:8000")
+    monkeypatch.setenv("MAX_UPLOAD_BYTES", "10485760")
+
+    import importlib
+    import app.config as config_module
+    importlib.reload(config_module)
+
+    s = config_module.Settings()
+    assert s.max_upload_bytes == 10485760