fix(openclaw): remove MCP/Skills/Prompts support from OpenClaw

OpenClaw only needs provider management functionality, not MCP, Skills,
or Prompts features. This commit removes the incorrectly added support:

- Revert SCHEMA_VERSION from 6 to 5 (remove v5->v6 migration)
- Remove enabled_openclaw field from mcp_servers and skills tables
- Remove openclaw field from McpApps and SkillApps structs
- Update DAO queries to exclude enabled_openclaw column
- Fix frontend components and types to exclude openclaw from MCP/Prompts
- Update all related test files

src-tauri/src/database/schema.rs

@@ -58,8 +58,7 @@ impl Database {
             id TEXT PRIMARY KEY, name TEXT NOT NULL, server_config TEXT NOT NULL,
             description TEXT, homepage TEXT, docs TEXT, tags TEXT NOT NULL DEFAULT '[]',
             enabled_claude BOOLEAN NOT NULL DEFAULT 0, enabled_codex BOOLEAN NOT NULL DEFAULT 0,
-            enabled_gemini BOOLEAN NOT NULL DEFAULT 0, enabled_opencode BOOLEAN NOT NULL DEFAULT 0,
-            enabled_openclaw BOOLEAN NOT NULL DEFAULT 0
+            enabled_gemini BOOLEAN NOT NULL DEFAULT 0, enabled_opencode BOOLEAN NOT NULL DEFAULT 0
         )",
             [],
         )
@@ -87,7 +86,6 @@ impl Database {
             enabled_codex BOOLEAN NOT NULL DEFAULT 0,
             enabled_gemini BOOLEAN NOT NULL DEFAULT 0,
             enabled_opencode BOOLEAN NOT NULL DEFAULT 0,
-            enabled_openclaw BOOLEAN NOT NULL DEFAULT 0,
             installed_at INTEGER NOT NULL DEFAULT 0
         )",
             [],
@@ -362,11 +360,6 @@ impl Database {
                         Self::migrate_v4_to_v5(conn)?;
                         Self::set_user_version(conn, 5)?;
                     }
-                    5 => {
-                        log::info!("迁移数据库从 v5 到 v6（OpenClaw 支持）");
-                        Self::migrate_v5_to_v6(conn)?;
-                        Self::set_user_version(conn, 6)?;
-                    }
                     _ => {
                         return Err(AppError::Database(format!(
                             "未知的数据库版本 {version}，无法迁移到 {SCHEMA_VERSION}"
@@ -859,7 +852,6 @@ impl Database {
                 enabled_claude BOOLEAN NOT NULL DEFAULT 0,
                 enabled_codex BOOLEAN NOT NULL DEFAULT 0,
                 enabled_gemini BOOLEAN NOT NULL DEFAULT 0,
-                enabled_openclaw BOOLEAN NOT NULL DEFAULT 0,
                 installed_at INTEGER NOT NULL DEFAULT 0
             )",
             [],
@@ -922,30 +914,6 @@ impl Database {
         Ok(())
     }
 
-    /// v5 -> v6 迁移：添加 OpenClaw 支持
-    ///
-    /// 为 mcp_servers 和 skills 表添加 enabled_openclaw 列。
-    fn migrate_v5_to_v6(conn: &Connection) -> Result<(), AppError> {
-        // 为 mcp_servers 表添加 enabled_openclaw 列
-        Self::add_column_if_missing(
-            conn,
-            "mcp_servers",
-            "enabled_openclaw",
-            "BOOLEAN NOT NULL DEFAULT 0",
-        )?;
-
-        // 为 skills 表添加 enabled_openclaw 列
-        Self::add_column_if_missing(
-            conn,
-            "skills",
-            "enabled_openclaw",
-            "BOOLEAN NOT NULL DEFAULT 0",
-        )?;
-
-        log::info!("v5 -> v6 迁移完成：已添加 OpenClaw 支持");
-        Ok(())
-    }
-
     /// 插入默认模型定价数据
     /// 格式: (model_id, display_name, input, output, cache_read, cache_creation)
     /// 注意: model_id 使用短横线格式（如 claude-haiku-4-5），与 API 返回的模型名称标准化后一致