feat(api): 支持外部客户端创建作品和更新版本

db/postgres/schema.sql

@@ -48,6 +48,7 @@ CREATE TABLE IF NOT EXISTS collections (
 CREATE TABLE IF NOT EXISTS notes (
   id BIGSERIAL PRIMARY KEY,
   collection_id BIGINT NOT NULL REFERENCES collections(id) ON DELETE CASCADE,
+  external_id TEXT,
   title TEXT NOT NULL,
   description TEXT NOT NULL DEFAULT '',
   tags TEXT NOT NULL DEFAULT '[]',
@@ -56,6 +57,9 @@ CREATE TABLE IF NOT EXISTS notes (
   created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
 );
 
+ALTER TABLE notes ADD COLUMN IF NOT EXISTS external_id TEXT;
+CREATE UNIQUE INDEX IF NOT EXISTS idx_notes_collection_external_id ON notes(collection_id, external_id) WHERE external_id IS NOT NULL AND external_id != '';
+
 CREATE TABLE IF NOT EXISTS images (
   id BIGSERIAL PRIMARY KEY,
   note_id BIGINT NOT NULL REFERENCES notes(id) ON DELETE CASCADE,
@@ -63,7 +67,7 @@ CREATE TABLE IF NOT EXISTS images (
   width INTEGER NOT NULL DEFAULT 0,
   height INTEGER NOT NULL DEFAULT 0,
   order_index INTEGER NOT NULL DEFAULT 0,
-  storage_provider TEXT NOT NULL DEFAULT 'local' CHECK (storage_provider IN ('local', 'tencent_cos')),
+  storage_provider TEXT NOT NULL DEFAULT 'local' CHECK (storage_provider IN ('local', 'tencent_cos', 'external')),
   storage_key TEXT NOT NULL DEFAULT '',
   version_number INTEGER NOT NULL DEFAULT 1 CHECK (version_number > 0)
 );