feat(cli): add initial CLI implementation with argument parsing and prompt handling

- Created package.json and package-lock.json for CLI package.
- Implemented argument parsing in args.ts to handle various flags and commands.
- Developed main CLI logic in cli.ts to execute commands and handle errors.
- Added configuration loading from a JSON file in config.ts, with environment variable support.
- Implemented prompt resolution and provider interaction in prompt.ts.
- Added usage documentation for the CLI.
- Configured TypeScript settings in tsconfig.json for the CLI package.
- Updated README in vscode package to reflect the new CLI functionality.
- Refactored root tsconfig.json to streamline project structure.

.gitea/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,24 @@
+## Summary
+
+Briefly describe what this PR changes and why.
+
+## Package(s)
+
+- [ ] `packages/chrome`
+- [ ] `packages/vscode`
+- [ ] `packages/cli`
+- [ ] `src/lib` (shared)
+- [ ] Docs / CI / repo meta
+
+## Test plan
+
+- [ ] `npm run chrome:typecheck` / `npm run chrome:test` (if Chrome or shared lib)
+- [ ] `npm run vscode:typecheck` / `npm run vscode:build` (if VS Code)
+- [ ] `npm run cli:typecheck` / `npm run cli:build` (if CLI)
+- [ ] Manual check (describe): 
+
+## Checklist
+
+- [ ] No API keys, tokens, or personal data in the diff
+- [ ] Docs / README updated if user-facing behavior changed
+- [ ] Related issue linked (if any): #