fix(wifi): fix AP mode, captive portal, and WiFi connect flow

- Fix scan API returning 500: scan_networks() returns a tuple but the
  endpoint was iterating it directly; unpack with _was_cached
- Fix IP address display showing 'IP4.ADDRESS[1]:x.x.x.x': nmcli -t
  output includes the field label; split on ':' before '/'
- Add force parameter to enable_ap_mode() to bypass WiFi/Ethernet
  guards; expose via force JSON body field in the AP enable endpoint
- Fix daemon auto-disabling forced AP: add _FORCE_AP_FLAG_PATH flag
  file written on force-enable and checked in check_and_manage_ap_mode
  before auto-disabling; disable_ap_mode() clears it
- Fix wifi_connected false positive in AP mode: _get_status_nmcli()
  was reporting wlan0 as 'connected' when it was running as AP;
  override wifi_connected=False when _is_ap_mode_active() is True
- Fix AP verification failure on async NM activation: retry
  _get_ap_status_nmcli() up to 5 times with 2s delay instead of
  single immediate check
- Fix WiFi connect ignoring existing NM connections: nmcli does not
  support 802-11-wireless.ssid as a column in 'connection show';
  replace with NAME,TYPE list then per-connection SSID query via -g
  (fixes 'netplan generate failed' error on Trixie / netplan systems)
- Fix failsafe AP re-enable blocked by Ethernet: all recovery-path
  enable_ap_mode() calls in connect_to_network() now pass force=True

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web_interface/blueprints/api_v3.py

@@ -6542,7 +6542,7 @@ def scan_wifi_networks():
         ap_was_active = wifi_manager._is_ap_mode_active()
 
         # Perform the scan (this will handle AP mode disabling/enabling internally)
-        networks = wifi_manager.scan_networks()
+        networks, _was_cached = wifi_manager.scan_networks()
 
         # Convert to dict format
         networks_data = [
@@ -6680,7 +6680,8 @@ def enable_ap_mode():
         from src.wifi_manager import WiFiManager
 
         wifi_manager = WiFiManager()
-        success, message = wifi_manager.enable_ap_mode()
+        force = bool((request.get_json(silent=True) or {}).get('force', False))
+        success, message = wifi_manager.enable_ap_mode(force=force)
 
         if success:
             return jsonify({