feat(keys): 新增密钥自动获取模型功能

- 添加 auto_fetch_models 字段支持定时从上游 API 获取可用模型
- 添加 locked_models 字段支持锁定模型，刷新时不会被删除
- 新增 ModelFetchScheduler 调度器定期执行模型获取任务
- 前端 KeyFormDialog 添加自动获取模型开关
- 前端 KeyAllowedModelsEditDialog 支持模型锁定操作
- ProviderDetailDrawer 显示密钥同步状态
- 数据库迁移添加新字段

alembic/versions/20260113_1759_e4ebe3233b40_add_auto_fetch_models_and_locked_models_.py

@@ -0,0 +1,95 @@
+"""add auto_fetch_models and locked_models to provider_api_keys
+
+Revision ID: e4ebe3233b40
+Revises: m4n5o6p7q8r9
+Create Date: 2026-01-13 17:59:53.119479+00:00
+
+为 provider_api_keys 表添加自动获取模型相关字段:
+1. auto_fetch_models: 是否启用自动获取模型
+2. last_models_fetch_at: 最后获取时间
+3. last_models_fetch_error: 最后获取错误信息
+4. locked_models: 被锁定的模型列表（刷新时不会被删除）
+
+注意: downgrade 操作会永久删除 auto_fetch_models 配置和 locked_models 数据
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy import inspect
+
+
+def _index_exists(index_name: str) -> bool:
+    """Check if an index exists"""
+    bind = op.get_bind()
+    inspector = inspect(bind)
+    indexes = inspector.get_indexes("provider_api_keys")
+    return any(idx["name"] == index_name for idx in indexes)
+
+
+# revision identifiers, used by Alembic.
+revision = 'e4ebe3233b40'
+down_revision = 'm4n5o6p7q8r9'
+branch_labels = None
+depends_on = None
+
+
+def _column_exists(table_name: str, column_name: str) -> bool:
+    """Check if a column exists in the table"""
+    bind = op.get_bind()
+    inspector = inspect(bind)
+    columns = [col["name"] for col in inspector.get_columns(table_name)]
+    return column_name in columns
+
+
+def upgrade() -> None:
+    """添加自动获取模型相关字段"""
+    if not _column_exists("provider_api_keys", "auto_fetch_models"):
+        op.add_column(
+            "provider_api_keys",
+            sa.Column("auto_fetch_models", sa.Boolean(), nullable=False, server_default="false"),
+        )
+
+    if not _column_exists("provider_api_keys", "last_models_fetch_at"):
+        op.add_column(
+            "provider_api_keys",
+            sa.Column("last_models_fetch_at", sa.DateTime(timezone=True), nullable=True),
+        )
+
+    if not _column_exists("provider_api_keys", "last_models_fetch_error"):
+        op.add_column(
+            "provider_api_keys",
+            sa.Column("last_models_fetch_error", sa.Text(), nullable=True),
+        )
+
+    if not _column_exists("provider_api_keys", "locked_models"):
+        op.add_column(
+            "provider_api_keys",
+            sa.Column("locked_models", sa.JSON(), nullable=True),
+        )
+
+    # 添加复合索引以优化调度器查询
+    if not _index_exists("ix_provider_api_keys_auto_fetch_active"):
+        op.create_index(
+            "ix_provider_api_keys_auto_fetch_active",
+            "provider_api_keys",
+            ["auto_fetch_models", "is_active"],
+            postgresql_where=sa.text("auto_fetch_models = true AND is_active = true"),
+        )
+
+
+def downgrade() -> None:
+    """移除自动获取模型相关字段"""
+    # 先删除索引
+    if _index_exists("ix_provider_api_keys_auto_fetch_active"):
+        op.drop_index("ix_provider_api_keys_auto_fetch_active", table_name="provider_api_keys")
+
+    if _column_exists("provider_api_keys", "locked_models"):
+        op.drop_column("provider_api_keys", "locked_models")
+
+    if _column_exists("provider_api_keys", "last_models_fetch_error"):
+        op.drop_column("provider_api_keys", "last_models_fetch_error")
+
+    if _column_exists("provider_api_keys", "last_models_fetch_at"):
+        op.drop_column("provider_api_keys", "last_models_fetch_at")
+
+    if _column_exists("provider_api_keys", "auto_fetch_models"):
+        op.drop_column("provider_api_keys", "auto_fetch_models")