Chore: Add .claude/settings.json to gitignore and remove from tracking

**Changes:**
- Added `.claude/` directory to .gitignore (Claude Code local settings)
- Removed `.claude/settings.json` from git tracking (local/environment-specific)

**Rationale:**
- `.claude/settings.json` contains user-specific Claude Code permissions and settings
- Should never be committed to git (similar to .vscode/, .idea/)
- Each developer should manage their own local settings
- Prevents merge conflicts from local configuration differences

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.claude/settings.json

@@ -1,7 +0,0 @@
-{
-  "permissions": {
-    "allow": [
-      "Bash(pm2 status:*)"
-    ]
-  }
-}

.gitignore

@@ -126,6 +126,10 @@ skills/global-skills
 **/.DS_Store
 Thumbs.db
 
+# Claude Code Local Settings
+.claude/
+.claude/settings.json
+
 # Package Manager Locks (use source control for dependency pinning)
 pnpm-lock.yaml
 bun.lock