Remove public SurrealDB JSON and update metadata

Delete duplicated frontend/public/json/surrealdb.json and update the canonical json/surrealdb.json file: restore original date_created, adjust description, normalize website URL, change default_credentials.password to null, and add notes about web UI and saved creds. Also include a tiny EOF/newline normalization in json/cliproxyapi.json.

json/cliproxyapi.json

@@ -41,4 +41,4 @@
       "type": "warning"
     }
   ]
-}
+}