feat(core/cli/utils): separate server/cli from core packge, reduces deps and pkg size

- Add deno.json for CLI package configuration and exports.
- Create mod.ts as the main entry point for CLI package.
- Implement createServer and createApp functions in app.ts for server setup and route registration.
- Add bin.ts for running the CLI as an MCP server using STDIO transport.
- Implement core, message, and SSE controllers for handling respective routes and functionalities.
- Create error schema for consistent error responses.
- Set up OpenAPI documentation routes for core and message handling.
- Introduce utility functions in the utils package for JSON parsing and time management.
- Update core package to version 0.2.0-beta.1 and adjust imports accordingly.
- Refactor existing code to utilize new utility functions and improve structure.

Author: yaonyan

deno.json

@@ -4,7 +4,7 @@
   "tasks": {
     "precommit": "deno lint && deno check && deno fmt"
   },
-  "workspace": ["./packages/core"],
+  "workspace": ["./packages/utils", "./packages/core", "./packages/cli"],
   "imports": {
     "@es-toolkit/es-toolkit": "jsr:@es-toolkit/es-toolkit@^1.37.2",
     "json-schema-faker": "npm:json-schema-faker@^0.5.9",