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>

backend/api/routes/stats.py

@@ -0,0 +1,43 @@
+"""Site visit statistics API."""
+
+from __future__ import annotations
+
+from fastapi import APIRouter
+
+from core.db import conn
+
+router = APIRouter()
+
+
+@router.post("/visit")
+def record_visit():
+    """Record a page visit. Increments today's count."""
+    sql = """
+        MERGE INTO site_visits sv
+        USING (SELECT TRUNC(SYSDATE) AS d FROM dual) src
+        ON (sv.visit_date = src.d)
+        WHEN MATCHED THEN UPDATE SET sv.visit_count = sv.visit_count + 1
+        WHEN NOT MATCHED THEN INSERT (visit_date, visit_count) VALUES (src.d, 1)
+    """
+    with conn() as c:
+        c.cursor().execute(sql)
+    return {"ok": True}
+
+
+@router.get("/visits")
+def get_visits():
+    """Return today's visit count and all-time total."""
+    sql_today = """
+        SELECT NVL(visit_count, 0) FROM site_visits WHERE visit_date = TRUNC(SYSDATE)
+    """
+    sql_total = """
+        SELECT NVL(SUM(visit_count), 0) FROM site_visits
+    """
+    with conn() as c:
+        cur = c.cursor()
+        cur.execute(sql_today)
+        row = cur.fetchone()
+        today = int(row[0]) if row else 0
+        cur.execute(sql_total)
+        total = int(cur.fetchone()[0])
+    return {"today": today, "total": total}