refactor(mcp): improve data structure with metadata/spec separation

- Separate MCP server metadata from connection spec for cleaner architecture
- Add comprehensive server entry fields: name, description, tags, homepage, docs
- Remove legacy format compatibility logic from extract_server_spec
- Implement data validation and filtering in get_servers_snapshot_for
- Add strict id consistency check in upsert_in_config_for
- Enhance import logic with defensive programming for corrupted data
- Simplify frontend by removing normalization logic (moved to backend)
- Improve error messages with contextual information
- Add comprehensive i18n support for new metadata fields

src/i18n/locales/en.json

@@ -281,8 +281,16 @@
     "form": {
       "title": "MCP Title (Unique)",
       "titlePlaceholder": "my-mcp-server",
+      "name": "Display Name",
+      "namePlaceholder": "e.g. @modelcontextprotocol/server-time",
       "description": "Description",
       "descriptionPlaceholder": "Optional description",
+      "tags": "Tags (comma separated)",
+      "tagsPlaceholder": "stdio, time, utility",
+      "homepage": "Homepage",
+      "homepagePlaceholder": "https://example.com",
+      "docs": "Docs",
+      "docsPlaceholder": "https://example.com/docs",
       "jsonConfig": "JSON Configuration",
       "jsonPlaceholder": "{\n  \"type\": \"stdio\",\n  \"command\": \"uvx\",\n  \"args\": [\"mcp-server-fetch\"]\n}",
       "tomlConfig": "TOML Configuration",

src/i18n/locales/zh.json

@@ -281,8 +281,16 @@
     "form": {
       "title": "MCP 标题（唯一）",
       "titlePlaceholder": "my-mcp-server",
+      "name": "显示名称",
+      "namePlaceholder": "例如 @modelcontextprotocol/server-time",
       "description": "描述",
       "descriptionPlaceholder": "可选的描述信息",
+      "tags": "标签（逗号分隔）",
+      "tagsPlaceholder": "stdio, time, utility",
+      "homepage": "主页链接",
+      "homepagePlaceholder": "https://example.com",
+      "docs": "文档链接",
+      "docsPlaceholder": "https://example.com/docs",
       "jsonConfig": "JSON 配置",
       "jsonPlaceholder": "{\n  \"type\": \"stdio\",\n  \"command\": \"uvx\",\n  \"args\": [\"mcp-server-fetch\"]\n}",
       "tomlConfig": "TOML 配置",