feat: add postgres migrations and repository adapters for vertical slice

crates/adapters/postgres/migrations/004_catalog.sql

@@ -0,0 +1,23 @@
+CREATE TABLE assets (
+    asset_id        UUID PRIMARY KEY,
+    volume_id       UUID NOT NULL REFERENCES storage_volumes(volume_id),
+    relative_path   TEXT NOT NULL,
+    checksum        TEXT NOT NULL,
+    asset_type      TEXT NOT NULL,
+    mime_type       TEXT NOT NULL,
+    file_size       BIGINT NOT NULL,
+    is_processed    BOOLEAN NOT NULL DEFAULT false,
+    owner_user_id   UUID NOT NULL REFERENCES users(id),
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_assets_checksum ON assets(checksum);
+CREATE INDEX idx_assets_owner ON assets(owner_user_id);
+
+CREATE TABLE asset_metadata (
+    asset_id         UUID NOT NULL REFERENCES assets(asset_id) ON DELETE CASCADE,
+    metadata_source  TEXT NOT NULL,
+    data             JSONB NOT NULL DEFAULT '{}',
+    updated_at       TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    PRIMARY KEY (asset_id, metadata_source)
+);