[WIP] feat: add TypeChecker API and Playground type info panel

[fansenze]

Summary

This PR introduces a TypeChecker lazy loading API for rslint and integrates real-time type information display in the Playground.

Changes:

• Go Backend (internal/api/)
  • Add typechecker.go: Implements TypeChecker struct with on-demand querying for node Type, Symbol, Signature, and FlowNode information
  • Extend IPC protocol with 5 new checker-related message kinds (checker.getNodeType, checker.getNodeSymbol, checker.getNodeSignature, checker.getNodeFlowNode, checker.getNodeInfo)
  • Support recursive collection of related types and symbols with cycle detection
• JS/TS SDK (packages/rslint/)
  • Add checker-types.ts: Define TypeScript interfaces for TypeDetails, SymbolDetails, SignatureDetails, FlowNodeDetails, etc.
  • Add remote-typechecker.ts: Implement RemoteTypeChecker class that proxies calls to Go backend via IPC
• Website Playground (website/)
  • Add NodeDetailPanel: Display detailed type information for selected AST nodes
  • Add ObjectTree: Tree view component for visualizing complex object structures
  • Add EditorTabs and JsonEditor: Support multi-tab editor with config editing
  • Add resizable component: Draggable panel resizing
  • Integrate TypeChecker: Fetch and display type information when clicking AST nodes

Snapshot:

Related Links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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