feat(mcp): add automatic key normalization for server entries

- Add normalize_server_keys() to ensure MCP server map keys match internal id fields
- Auto-normalize on all read/write operations (get, upsert, delete, import, sync)
- Handle edge cases: empty/whitespace ids, key renaming, conflict resolution
- Auto-save config when normalization detects changes
- Apply cargo fmt for code formatting consistency

This enhancement improves data integrity by automatically fixing inconsistencies
between server entry keys and their id fields, especially after manual config edits.

src-tauri/src/lib.rs

@@ -1,16 +1,16 @@
 mod app_config;
-mod claude_plugin;
 mod claude_mcp;
-mod mcp;
+mod claude_plugin;
 mod codex_config;
 mod commands;
 mod config;
 mod import_export;
+mod mcp;
 mod migration;
 mod provider;
 mod settings;
-mod store;
 mod speedtest;
+mod store;
 
 use store::AppState;
 use tauri::{