feat: remove automatic Happy daemon startup

Removes unreliable automatic Happy Coder daemon startup, allowing users
to start it manually when needed for better reliability and control.

**Changes:**
- scripts/init-repo.sh: Removed Happy daemon startup code and lock cleanup
- scripts/startapp.sh: Updated comment to reflect init-repo only handles git
- README.md: Updated startup flow documentation and troubleshooting section
- CLAUDE.md: Updated startup flow and file descriptions

**Benefits:**
- No more unreliable automatic daemon startup failures
- Users can start Happy daemon manually when needed: `happy daemon start`
- Cleaner container startup without Happy-related delays or errors
- Happy configuration and credentials still persist on PVC when used

**Usage:**
Users can now manually start Happy Coder when needed:
```bash
happy daemon start  # Start when needed
happy daemon status # Check status
happy daemon stop   # Stop if needed
```

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

scripts/startapp.sh

@@ -4,7 +4,7 @@ set -e
 
 echo "=== Starting Dev Container ==="
 
-# Initialize repository and Happy Coder
+# Initialize repository
 /usr/local/bin/init-repo
 
 # Get workspace directory