refactor: reorganize into monorepo with Bun workspaces

- Split project into three packages:
  - @react-telegram/core: Core React reconciler
  - @react-telegram/mtcute-adapter: MTCute Telegram adapter
  - @react-telegram/examples: Example bots (private)
- Add <br /> tag support for line breaks
- Update all examples to use <br /> instead of {'\n'}
- Configure Bun workspaces for better package management
- Update imports to use package names instead of relative paths
- Update README with new installation instructions
- Remove test files (moved to separate testing setup)

BREAKING CHANGE: Package names changed from react-telegram to @react-telegram/*

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: zhigang1992

.claude/settings.local.json

@@ -16,7 +16,10 @@
       "Bash(bun tsc:*)",
       "Bash(ls:*)",
       "Bash(bun x tsc:*)",
-      "Bash(bun:*)"
+      "Bash(bun:*)",
+      "Bash(mkdir:*)",
+      "Bash(cp:*)",
+      "Bash(rg:*)"
     ],
     "deny": []
   }