feat: phone webhook integration (callstart/callend on port 8081)

- New webhook server on port 8081 for phone system (PBX)
- Endpoints: GET/POST /{extension}/callstart and /{extension}/callend
- New 'phone_extension' field on users (Durchwahl)
- Only activates when user is anwesend or homeoffice (AIDA)
- Sets WLED to phone_active color (red) on callstart
- Restores previous Teams/AIDA color on callend
- Polling skips WLED update while phone is active
- Dashboard shows phone badge when user is in a call
- New color rule 'phone_active' (configurable via web UI)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

database.py

@@ -25,6 +25,7 @@ def init_db():
             display_name TEXT NOT NULL DEFAULT '',
             email TEXT DEFAULT '',
             personal_nr TEXT DEFAULT '',
+            phone_extension TEXT DEFAULT '',
             active INTEGER NOT NULL DEFAULT 0
         );
 
@@ -60,6 +61,7 @@ def init_db():
             user_azure_id TEXT PRIMARY KEY REFERENCES users(azure_id) ON DELETE CASCADE,
             last_aida_status TEXT DEFAULT '',
             last_teams_status TEXT DEFAULT '',
+            phone_active INTEGER DEFAULT 0,
             updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
         );
 
@@ -92,6 +94,14 @@ def init_db():
         conn.execute("ALTER TABLE wled_devices ADD COLUMN last_check TIMESTAMP")
     except Exception:
         pass
+    try:
+        conn.execute("ALTER TABLE users ADD COLUMN phone_extension TEXT DEFAULT ''")
+    except Exception:
+        pass
+    try:
+        conn.execute("ALTER TABLE state ADD COLUMN phone_active INTEGER DEFAULT 0")
+    except Exception:
+        pass
 
     defaults = {
         "azure_client_id": "",
@@ -129,6 +139,7 @@ def init_db():
         ("teams_inactive", 0, 255, 0, ""),
         ("teams_offwork", 0, 255, 0, ""),
         ("teams_outofoffice", 0, 255, 0, ""),
+        ("phone_active", 255, 0, 0, ""),
     ]
     for status, r, g, b, effect in default_colors:
         conn.execute(