Add admin features, responsive UI, user reviews, visit stats, and channel-colored markers

- Admin: video management with Google Maps match status, manual restaurant mapping, restaurant remap on name change
- Admin: user management tab with favorites/reviews detail
- Admin: channel deletion fix for IDs with slashes
- Frontend: responsive mobile layout (map top, list bottom, 2-row header)
- Frontend: channel-colored map markers with legend
- Frontend: my reviews list, favorites toggle, visit counter overlay
- Frontend: force light mode for dark theme devices
- Backend: visit tracking (site_visits table), user reviews endpoint
- Backend: bulk transcript/extract streaming, geocode key fixes
- Nginx config for production deployment

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

frontend/src/app/globals.css

@@ -3,6 +3,7 @@
 :root {
   --background: #ffffff;
   --foreground: #171717;
+  color-scheme: light only;
 }
 
 @theme inline {
@@ -11,6 +12,18 @@
   --font-sans: var(--font-geist);
 }
 
+@media (prefers-color-scheme: dark) {
+  :root {
+    --background: #ffffff;
+    --foreground: #171717;
+    color-scheme: light only;
+  }
+}
+
+* {
+  color-scheme: light only;
+}
+
 body {
   background: var(--background);
   color: var(--foreground);
@@ -20,3 +33,21 @@ html, body, #__next {
   height: 100%;
   margin: 0;
 }
+
+input, select, textarea {
+  color-scheme: light;
+}
+
+/* Force Google Maps InfoWindow to light mode */
+.gm-style .gm-style-iw,
+.gm-style .gm-style-iw-c,
+.gm-style .gm-style-iw-d,
+.gm-style .gm-style-iw-t {
+  background-color: #ffffff !important;
+  color: #171717 !important;
+  color-scheme: light !important;
+}
+
+.gm-style .gm-style-iw-d {
+  overflow: auto !important;
+}