docs: add env template examples for backend and frontend

.env.example

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+# ==============================================================================
+# AI Virtual Wardrobe - Backend Environment Configuration Template (.env.example)
+# ==============================================================================
+
+# 1. Authentication & Security
+JWT_SECRET_KEY=generate_a_random_jwt_secret_key_here
+
+# 2. AI Model API Keys (Fill with your credentials)
+GEMINI_API_KEY=your_gemini_api_key_here
+OPENAI_API_KEY=your_openai_api_key_here
+OPENAI_MODEL=gpt-image-1
+NVIDIA_API_KEY=your_nvidia_api_key_here
+NVIDIA_MODEL=moonshotai/kimi-k2.6
+CLOTHES_SEGMENTATION_MODEL=mattmdjaga/segformer_b2_clothes
+TRYON_MODEL=zhengchong/CatVTON
+
+# 3. Storage Mode Configuration
+# - local: Store uploads directly on the machine's disk (uploads/ directory) - NO KEYS REQUIRED.
+# - r2: Cloudflare R2 cloud storage (Requires R2 variables below).
+STORAGE_MODE=local
+UPLOAD_DIR=uploads
+SERVER_HOST_URL=http://localhost:8002
+PORT=8002
+
+# Cloudflare R2 Credentials (Only required if STORAGE_MODE=r2)
+# R2_BUCKET_NAME=your_r2_bucket_name
+# R2_ACCESS_KEY_ID=your_cloudflare_r2_access_key_id
+# R2_SECRET_ACCESS_KEY=your_cloudflare_r2_secret_access_key
+# R2_ENDPOINT_URL=https://your-account-id.r2.cloudflarestorage.com
+
+# 4. PostgreSQL Database Config
+POSTGRES_SERVER=localhost
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=your_db_password
+POSTGRES_DB=wardrobe_db
+
+# 5. Redis Broker (For Celery Task Queue and Caching)
+REDIS_HOST=localhost
+REDIS_PORT=6380
+
+# 6. CUDA / GPU index configurations for local CatVTON models
+CUDA_VISIBLE_DEVICES=2
+CUDA_DEVICE=cuda:2