feat: initial implementation of AI Commit Ext VS Code extension

- Add VS Code extension with OpenCode AI integration
- Generate Conventional Commit messages via SCM header button
- Include gitService for staged changes detection
- Include opencodeService for CLI invocation
- Add configuration options for model, includeUnstaged, notifications
- Add button disable during generation with progress indicator
- Add sparkle icon for the action button
- Include package.json, tsconfig, and basic project setup

readme.md

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+# AI Commit Ext
+
+Generate commit messages using OpenCode AI.
+
+## Features
+
+- Generate Conventional Commit messages via OpenCode
+- Button in SCM header
+- Progress indicator while generating
+
+## Requirements
+
+- VS Code 1.71+
+- OpenCode CLI installed
+
+## Installation
+
+1. Clone this repository
+2. npm install
+3. Press F5 to test
+
+## Configuration
+
+- `aiCommitExt.model` - Model to use
+- `aiCommitExt.includeUnstaged` - Use unstaged changes if nothing staged
+- `aiCommitExt.showNotification` - Show notifications
+
+## Usage
+
+1. Open a Git repository in VS Code
+2. Stage some changes
+3. Click the sparkle icon in the SCM header
+4. Commit message is generated and filled in