feat(chat): integrate chat project into monorepo with full app structure

- Restructure chat as apps/mobile, apps/web, apps/landing, backend
- Add NestJS backend for secure Azure OpenAI API calls
- Remove exposed API key from mobile app (security fix)
- Add shared chat-types package
- Create SvelteKit web app scaffold
- Create Astro landing page scaffold
- Update pnpm workspace configuration
- Add project-level CLAUDE.md documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

chat/apps/mobile/scripts/fix_templates_table.sql

@@ -0,0 +1,73 @@
+-- Überprüfe und korrigiere die templates-Tabelle
+
+-- 1. Prüfe, ob die templates-Tabelle existiert, erstelle sie falls nicht
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT FROM information_schema.tables 
+    WHERE table_schema = 'public' 
+    AND table_name = 'templates'
+  ) THEN
+    -- Erstelle die Tabelle für Vorlagen
+    CREATE TABLE public.templates (
+      id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+      user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
+      name TEXT NOT NULL,
+      description TEXT,
+      system_prompt TEXT NOT NULL,
+      initial_question TEXT,
+      model_id UUID REFERENCES models(id),
+      color TEXT DEFAULT '#0A84FF',
+      is_default BOOLEAN DEFAULT false,
+      created_at TIMESTAMP WITH TIME ZONE DEFAULT now(),
+      updated_at TIMESTAMP WITH TIME ZONE DEFAULT now()
+    );
+    
+    RAISE NOTICE 'Tabelle templates wurde erstellt.';
+  ELSE
+    RAISE NOTICE 'Tabelle templates existiert bereits.';
+  END IF;
+END
+$$;
+
+-- 2. Prüfe, ob die color-Spalte existiert, füge sie hinzu falls nicht
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT FROM information_schema.columns 
+    WHERE table_schema = 'public' 
+    AND table_name = 'templates' 
+    AND column_name = 'color'
+  ) THEN
+    ALTER TABLE public.templates ADD COLUMN color TEXT DEFAULT '#0A84FF';
+    RAISE NOTICE 'Spalte color zur templates-Tabelle hinzugefügt.';
+  ELSE
+    RAISE NOTICE 'Spalte color existiert bereits in der templates-Tabelle.';
+  END IF;
+END
+$$;
+
+-- 3. Row Level Security
+ALTER TABLE templates ENABLE ROW LEVEL SECURITY;
+
+-- Lösche bestehende Policies, falls vorhanden
+DROP POLICY IF EXISTS "Users can view their own templates" ON templates;
+DROP POLICY IF EXISTS "Users can create their own templates" ON templates;
+DROP POLICY IF EXISTS "Users can update their own templates" ON templates;
+DROP POLICY IF EXISTS "Users can delete their own templates" ON templates;
+
+-- Erstelle die Policies neu
+CREATE POLICY "Users can view their own templates" ON templates
+  FOR SELECT USING (user_id = auth.uid());
+
+CREATE POLICY "Users can create their own templates" ON templates
+  FOR INSERT WITH CHECK (user_id = auth.uid());
+
+CREATE POLICY "Users can update their own templates" ON templates
+  FOR UPDATE USING (user_id = auth.uid());
+
+CREATE POLICY "Users can delete their own templates" ON templates
+  FOR DELETE USING (user_id = auth.uid());
+
+-- 4. Zeige einige Beispieldaten an
+SELECT id, name, description, color FROM templates LIMIT 5;