Add rotary phone web interface with multiple greeting support

Features:
- Web interface for managing rotary phone system
- Support for multiple greeting messages with selector
- Direct audio playback in browser for recordings and greetings
- Upload multiple WAV files at once
- Set active greeting that plays when phone is picked up
- HiFiBerry DAC+ADC Pro audio configuration
- GPIO-based handset detection and audio recording
- Real-time status monitoring with auto-refresh

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

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

.claude/settings.local.json

@@ -0,0 +1,10 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(python -m py_compile:*)",
+      "Bash(git add:*)"
+    ],
+    "deny": [],
+    "ask": []
+  }
+}