feat(admin): add admin dashboard UI with resource overview cards

- Add admin dashboard UI served at `GET /admin` with static page `static/admin_dashboard.html`
- Display 6 fixed resource cards: `mcp_services`, `ssls`, `global_rules`, `routes`, `upstreams`, `services`
- Show count and formatted last updated time for each resource
- Update README and README_CN with dashboard screenshot and documentation
- Adjust API port in RUNTIME_CONFIG_API.md from 8080 to 8081
- Enhance dashboard to handle Rust SystemTime serialization format
- Render resource cards in fixed order to avoid layout shift on refresh

Merge branch 'feat_mcp_arguments'

feat(upstream): change nodes field from Vec to HashMap with weight su…

…pport

- Update Upstream struct to use HashMap for nodes to support weighted load balancing
- Modify test cases in resource_manager.rs and resource_validator.rs to use HashMap
- Add Default implementation for Upstream struct
- Update test data structures to match new nodes format
- Ensure backward compatibility with existing Upstream configuration handling

docs(README): update Streamable HTTP protocol date to 2025-03-26

Merge pull request #11 from dhruv-bansal/main

Proper handling of upstream post/put/delete request

feat(utils): add openapi path to name conversion utility

Add convert_openapi_path_to_name function to transform HTTP method and path into a standardized name format. Includes comprehensive test cases covering various path patterns and HTTP methods.

refactor: update string formatting to use inline variable syntax

docs: update README badges with new colors and add DeepWiki link

Update the badge colors for better visibility and add a new DeepWiki badge to provide additional resources for users

update types to 2025-03-26-schema.json

feat: enhance CI workflow by adding caching for Cargo dependencies an…

…d running Clippy