feat: add postgres migrations and repository adapters for vertical slice

crates/adapters/postgres/migrations/002_update_users.sql

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+ALTER TABLE users ADD COLUMN username TEXT NOT NULL DEFAULT '';
+ALTER TABLE users DROP COLUMN role;
+ALTER TABLE users ADD CONSTRAINT users_username_unique UNIQUE (username);

crates/adapters/postgres/migrations/003_storage.sql

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+CREATE TABLE storage_volumes (
+    volume_id       UUID PRIMARY KEY,
+    volume_name     TEXT NOT NULL,
+    uri_prefix      TEXT NOT NULL,
+    is_writable     BOOLEAN NOT NULL DEFAULT true,
+    available_bytes BIGINT NOT NULL DEFAULT 0
+);
+
+CREATE TABLE library_paths (
+    path_id              UUID PRIMARY KEY,
+    volume_id            UUID NOT NULL REFERENCES storage_volumes(volume_id),
+    relative_path        TEXT NOT NULL,
+    is_ingest_destination BOOLEAN NOT NULL DEFAULT false,
+    ownership_policy     TEXT NOT NULL DEFAULT 'unassigned',
+    designated_owner_id  UUID
+);
+
+CREATE TABLE quota_definitions (
+    quota_id     UUID PRIMARY KEY,
+    owner_scope  UUID NOT NULL,
+    is_enforced  BOOLEAN NOT NULL DEFAULT true
+);
+
+CREATE TABLE quota_rules (
+    rule_id      UUID PRIMARY KEY,
+    quota_id     UUID NOT NULL REFERENCES quota_definitions(quota_id) ON DELETE CASCADE,
+    dimension    TEXT NOT NULL,
+    limit_value  BIGINT NOT NULL,
+    time_period  TEXT NOT NULL,
+    is_unlimited BOOLEAN NOT NULL DEFAULT false
+);
+
+CREATE TABLE usage_ledger (
+    entry_id        UUID PRIMARY KEY,
+    user_id         UUID NOT NULL REFERENCES users(id),
+    usage_type      TEXT NOT NULL,
+    consumed_amount BIGINT NOT NULL,
+    timestamp       TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    context         TEXT NOT NULL DEFAULT ''
+);
+
+CREATE TABLE ingest_sessions (
+    session_id           UUID PRIMARY KEY,
+    uploader_user_id     UUID NOT NULL REFERENCES users(id),
+    client_device_id     TEXT NOT NULL,
+    original_filename    TEXT NOT NULL,
+    client_checksum      TEXT NOT NULL,
+    target_library_path_id UUID NOT NULL REFERENCES library_paths(path_id),
+    status               TEXT NOT NULL DEFAULT 'uploading',
+    created_at           TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    error_message        TEXT
+);

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

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+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)
+);

crates/adapters/postgres/migrations/005_organization.sql

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+CREATE TABLE albums (
+    album_id         UUID PRIMARY KEY,
+    title            TEXT NOT NULL,
+    description      TEXT NOT NULL DEFAULT '',
+    creator_user_id  UUID NOT NULL REFERENCES users(id),
+    cover_asset_id   UUID,
+    start_date       TIMESTAMPTZ,
+    end_date         TIMESTAMPTZ,
+    created_at       TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE album_entries (
+    album_id         UUID NOT NULL REFERENCES albums(album_id) ON DELETE CASCADE,
+    asset_id         UUID NOT NULL REFERENCES assets(asset_id) ON DELETE CASCADE,
+    sort_order       INTEGER NOT NULL DEFAULT 0,
+    added_at         TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    added_by_user_id UUID NOT NULL REFERENCES users(id),
+    PRIMARY KEY (album_id, asset_id)
+);
+
+CREATE TABLE tags (
+    tag_id     UUID PRIMARY KEY,
+    name       TEXT NOT NULL,
+    tag_source TEXT NOT NULL DEFAULT 'user_manual'
+);
+
+CREATE TABLE asset_tags (
+    asset_id           UUID NOT NULL REFERENCES assets(asset_id) ON DELETE CASCADE,
+    tag_id             UUID NOT NULL REFERENCES tags(tag_id) ON DELETE CASCADE,
+    tagged_by_user_id  UUID,
+    confidence         DOUBLE PRECISION NOT NULL DEFAULT 1.0,
+    PRIMARY KEY (asset_id, tag_id)
+);