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/app_config.rs

@@ -15,8 +15,6 @@ pub struct McpApps {
     pub gemini: bool,
     #[serde(default)]
     pub opencode: bool,
-    #[serde(default)]
-    pub openclaw: bool,
 }
 
 impl McpApps {
@@ -27,7 +25,7 @@ impl McpApps {
             AppType::Codex => self.codex,
             AppType::Gemini => self.gemini,
             AppType::OpenCode => self.opencode,
-            AppType::OpenClaw => self.openclaw,
+            AppType::OpenClaw => false, // OpenClaw doesn't support MCP
         }
     }
 
@@ -38,7 +36,7 @@ impl McpApps {
             AppType::Codex => self.codex = enabled,
             AppType::Gemini => self.gemini = enabled,
             AppType::OpenCode => self.opencode = enabled,
-            AppType::OpenClaw => self.openclaw = enabled,
+            AppType::OpenClaw => {} // OpenClaw doesn't support MCP, ignore
         }
     }
 
@@ -57,15 +55,12 @@ impl McpApps {
         if self.opencode {
             apps.push(AppType::OpenCode);
         }
-        if self.openclaw {
-            apps.push(AppType::OpenClaw);
-        }
         apps
     }
 
     /// 检查是否所有应用都未启用
     pub fn is_empty(&self) -> bool {
-        !self.claude && !self.codex && !self.gemini && !self.opencode && !self.openclaw
+        !self.claude && !self.codex && !self.gemini && !self.opencode
     }
 }
 
@@ -80,8 +75,6 @@ pub struct SkillApps {
     pub gemini: bool,
     #[serde(default)]
     pub opencode: bool,
-    #[serde(default)]
-    pub openclaw: bool,
 }
 
 impl SkillApps {
@@ -92,7 +85,7 @@ impl SkillApps {
             AppType::Codex => self.codex,
             AppType::Gemini => self.gemini,
             AppType::OpenCode => self.opencode,
-            AppType::OpenClaw => self.openclaw,
+            AppType::OpenClaw => false, // OpenClaw doesn't support Skills
         }
     }
 
@@ -103,7 +96,7 @@ impl SkillApps {
             AppType::Codex => self.codex = enabled,
             AppType::Gemini => self.gemini = enabled,
             AppType::OpenCode => self.opencode = enabled,
-            AppType::OpenClaw => self.openclaw = enabled,
+            AppType::OpenClaw => {} // OpenClaw doesn't support Skills, ignore
         }
     }
 
@@ -122,15 +115,12 @@ impl SkillApps {
         if self.opencode {
             apps.push(AppType::OpenCode);
         }
-        if self.openclaw {
-            apps.push(AppType::OpenClaw);
-        }
         apps
     }
 
     /// 检查是否所有应用都未启用
     pub fn is_empty(&self) -> bool {
-        !self.claude && !self.codex && !self.gemini && !self.opencode && !self.openclaw
+        !self.claude && !self.codex && !self.gemini && !self.opencode
     }
 
     /// 仅启用指定应用（其他应用设为禁用）