feat: Add Continuous Delivery system with auto-commit and file watcher

Automatically commit and push changes to GitHub with zero manual intervention.

Features:
- File watcher mode: Auto-detects changes in real-time
- Timer mode: Commits at regular intervals (default 5 minutes)
- Smart exclusions: Ignores temp files, sessions, cache, db files
- Retry logic: Auto-retries failed pushes
- Change summaries: Detailed commit messages with file lists

Components:
- auto-deploy.ps1: Core CD engine with file watcher
- start-cd.ps1: Easy-to-use wrapper with commands
- .cd-config.json: Configuration file
- CONTINUOUS_DELIVERY_GUIDE.md: Complete documentation

Usage:
  .\start-cd.ps1 watch    # Start file watcher (recommended)
  .\start-cd.ps1 start    # Timer mode (every 5 min)
  .\start-cd.ps1 once     # One-time commit

Also removed db_data/ from git tracking (now in .gitignore).
Database runtime files should never be committed.

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

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

.cd-config.json

@@ -0,0 +1,18 @@
+{
+  "intervalSeconds": 300,
+  "branch": "dev",
+  "commitPrefix": "auto:",
+  "excludePatterns": [
+    "f_data/data_sessions/*",
+    "f_data/data_cache/_c_tpl/*",
+    ".setup_complete",
+    "*.log",
+    "db_data/*",
+    "node_modules/*",
+    "vendor/*",
+    ".git/*",
+    ".vscode/*"
+  ],
+  "enableNotifications": true,
+  "autoStart": false
+}