feat: Apple Watch app + Paywall + Privacy Policy + rebranding

## Major Features
- Apple Watch companion app (6 phases complete)
  - WatchConnectivity iPhone ↔ Watch
  - HealthKit integration (HR, calories)
  - SwiftUI premium UI
  - 9 complication types
  - Always-On Display support

- Paywall screen with RevenueCat integration
- Privacy Policy screen
- App rebranding: tabatago → TabataFit
- Bundle ID: com.millianlmx.tabatafit

## Changes
- New: ios/TabataFit Watch App/ (complete Watch app)
- New: app/paywall.tsx (subscription UI)
- New: app/privacy.tsx (privacy policy)
- New: src/features/watch/ (Watch sync hooks)
- New: admin-web/ (admin dashboard)
- Updated: app.json, package.json (branding)
- Updated: profile.tsx (paywall + privacy links)
- Updated: i18n translations (EN/FR/DE/ES)
- New: app icon 1024x1024

## Watch App Files
- TabataFitWatchApp.swift (entry point)
- ContentView.swift (premium UI)
- HealthKitManager.swift (HR + calories)
- WatchSessionManager.swift (communication)
- Complications/ (WidgetKit)
- UserDefaults+Shared.swift (data sharing)

admin-web/app/collections/page.tsx

@@ -0,0 +1,94 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { supabase } from "@/lib/supabase";
+import { Button } from "@/components/ui/button";
+import { Card, CardContent } from "@/components/ui/card";
+import { Badge } from "@/components/ui/badge";
+import { Plus, Trash2, Edit, Loader2, FolderOpen } from "lucide-react";
+import type { Database } from "@/lib/supabase";
+
+type Collection = Database["public"]["Tables"]["collections"]["Row"];
+
+export default function CollectionsPage() {
+  const [collections, setCollections] = useState<Collection[]>([]);
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    fetchCollections();
+  }, []);
+
+  const fetchCollections = async () => {
+    try {
+      const { data, error } = await supabase.from("collections").select("*");
+      if (error) throw error;
+      setCollections(data || []);
+    } catch (error) {
+      console.error("Failed to fetch collections:", error);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div className="p-8">
+      <div className="flex justify-between items-center mb-8">
+        <div>
+          <h1 className="text-3xl font-bold text-white mb-2">Collections</h1>
+          <p className="text-neutral-400">Organize workouts into collections</p>
+        </div>
+        <Button className="bg-orange-500 hover:bg-orange-600">
+          <Plus className="w-4 h-4 mr-2" />
+          Add Collection
+        </Button>
+      </div>
+
+      {loading ? (
+        <div className="flex justify-center p-8">
+          <Loader2 className="w-8 h-8 animate-spin text-orange-500" />
+        </div>
+      ) : (
+        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
+          {collections.map((collection) => (
+            <Card key={collection.id} className="bg-neutral-900 border-neutral-800">
+              <CardContent className="p-6">
+                <div className="flex items-start gap-4">
+                  <div className="w-12 h-12 bg-neutral-800 rounded-xl flex items-center justify-center text-2xl">
+                    {collection.icon}
+                  </div>
+                  
+                  <div className="flex-1 min-w-0">
+                    <div className="flex items-start justify-between">
+                      <div>
+                        <h3 className="text-lg font-semibold text-white">{collection.title}</h3>
+                        <p className="text-neutral-400 text-sm mt-1">{collection.description}</p>
+                      </div>
+                      
+                      <div className="flex gap-2">
+                        <Button variant="ghost" size="icon" className="text-neutral-400 hover:text-white">
+                          <Edit className="w-4 h-4" />
+                        </Button>
+                        <Button variant="ghost" size="icon" className="text-neutral-400 hover:text-red-500">
+                          <Trash2 className="w-4 h-4" />
+                        </Button>
+                      </div>
+                    </div>
+                    
+                    {collection.gradient && (
+                      <div
+                        className="mt-3 h-2 rounded-full"
+                        style={{
+                          background: `linear-gradient(to right, ${collection.gradient[0]}, ${collection.gradient[1]})`,
+                        }}
+                      />
+                    )}
+                  </div>
+                </div>
+              </CardContent>
+            </Card>
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}