feat(#67): Add support for multiple pokedexes per user

supabase/migrations/20250127000001_add_pokedexes_table.sql

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+-- Create pokedexes table
+CREATE TABLE pokedexes (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  "userId" UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
+  name TEXT NOT NULL,
+  description TEXT,
+
+  -- Type flags (combinable)
+  "isLivingDex" BOOLEAN DEFAULT FALSE,
+  "isShinyDex" BOOLEAN DEFAULT FALSE,
+  "isOriginDex" BOOLEAN DEFAULT FALSE,
+  "isFormDex" BOOLEAN DEFAULT FALSE,
+
+  -- Scope (NULL = all games, or specific game)
+  "gameScope" TEXT,
+
+  "createdAt" TIMESTAMPTZ DEFAULT NOW(),
+  "updatedAt" TIMESTAMPTZ DEFAULT NOW(),
+
+  -- User can't have duplicate pokédex names
+  UNIQUE("userId", name)
+);
+
+-- Create index for performance
+CREATE INDEX idx_pokedexes_user_id ON pokedexes("userId");
+
+-- Trigger to automatically update updated_at timestamp
+CREATE TRIGGER update_pokedexes_updated_at
+    BEFORE UPDATE ON pokedexes
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();
+
+-- Enable RLS
+ALTER TABLE pokedexes ENABLE ROW LEVEL SECURITY;
+
+-- RLS POLICIES - CRITICAL: Users can ONLY access their own pokédexes
+
+-- Users can ONLY view their own pokédexes
+CREATE POLICY "Users can view own pokedexes" ON pokedexes
+  FOR SELECT USING (auth.uid() = "userId");
+
+-- Users can ONLY create pokédexes for themselves
+CREATE POLICY "Users can create own pokedexes" ON pokedexes
+  FOR INSERT WITH CHECK (auth.uid() = "userId");
+
+-- Users can ONLY update their own pokédexes
+CREATE POLICY "Users can update own pokedexes" ON pokedexes
+  FOR UPDATE USING (auth.uid() = "userId");
+
+-- Users can ONLY delete their own pokédexes
+CREATE POLICY "Users can delete own pokedexes" ON pokedexes
+  FOR DELETE USING (auth.uid() = "userId");