[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/alembic/versions/001_initial_schema.py

@@ -0,0 +1,63 @@
+"""initial schema — images, tags, image_tags
+
+Revision ID: 001
+Revises:
+Create Date: 2026-05-02
+
+"""
+from typing import Sequence, Union
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+from alembic import op
+
+revision: str = "001"
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "images",
+        sa.Column("id", postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column("hash", sa.String(64), nullable=False),
+        sa.Column("filename", sa.String(), nullable=False),
+        sa.Column("mime_type", sa.String(20), nullable=False),
+        sa.Column("size_bytes", sa.BigInteger(), nullable=False),
+        sa.Column("width", sa.Integer(), nullable=False),
+        sa.Column("height", sa.Integer(), nullable=False),
+        sa.Column("storage_key", sa.String(64), nullable=False),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
+        sa.PrimaryKeyConstraint("id"),
+        sa.UniqueConstraint("hash", name="uq_images_hash"),
+    )
+    op.create_index("ix_images_hash", "images", ["hash"])
+
+    op.create_table(
+        "tags",
+        sa.Column("id", postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column("name", sa.String(64), nullable=False),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
+        sa.PrimaryKeyConstraint("id"),
+        sa.UniqueConstraint("name", name="uq_tags_name"),
+    )
+    op.create_index("ix_tags_name", "tags", ["name"])
+    op.create_index("ix_tags_name_prefix", "tags", ["name"], postgresql_ops={"name": "varchar_pattern_ops"})
+
+    op.create_table(
+        "image_tags",
+        sa.Column("image_id", postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column("tag_id", postgresql.UUID(as_uuid=True), nullable=False),
+        sa.ForeignKeyConstraint(["image_id"], ["images.id"], ondelete="CASCADE"),
+        sa.ForeignKeyConstraint(["tag_id"], ["tags.id"], ondelete="RESTRICT"),
+        sa.PrimaryKeyConstraint("image_id", "tag_id"),
+        sa.UniqueConstraint("image_id", "tag_id", name="uq_image_tag"),
+    )
+    op.create_index("ix_image_tags_image_id", "image_tags", ["image_id"])
+    op.create_index("ix_image_tags_tag_id", "image_tags", ["tag_id"])
+
+
+def downgrade() -> None:
+    op.drop_table("image_tags")
+    op.drop_table("tags")
+    op.drop_table("images")