feat: misc — cooking mode, OpenAPI docs, email, storage, upload, homepage

Cooking mode step-by-step view. OpenAPI 3.1 spec auto-generated from Zod schemas.
Email lib (resend). Redis client. S3 storage helper. Photo upload endpoint.
Landing page. Short recipe URL redirect /r/[id]. API docs page.

.env.example

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+# Database
+DATABASE_URL=postgresql://epicure:epicure@localhost:5432/epicure
+
+# Redis
+REDIS_URL=redis://localhost:6379
+
+# Storage (MinIO / S3-compatible)
+STORAGE_ENDPOINT=http://localhost:9000
+STORAGE_ACCESS_KEY=minioadmin
+STORAGE_SECRET_KEY=minioadmin
+STORAGE_BUCKET=epicure-uploads
+STORAGE_REGION=us-east-1
+
+# Auth (generate with: openssl rand -base64 32)
+BETTER_AUTH_SECRET=
+BETTER_AUTH_URL=http://localhost:3000
+
+# OAuth
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+
+# SMTP (leave blank to log emails to console in dev)
+SMTP_HOST=
+SMTP_PORT=587
+SMTP_SECURE=false
+SMTP_USER=
+SMTP_PASS=
+SMTP_FROM=Epicure <noreply@epicure.app>
+
+# Stripe (optional — webhook stub only)
+STRIPE_WEBHOOK_SECRET=
+
+# AI Providers (configure at least one)
+OPENROUTER_API_KEY=
+OPENROUTER_DEFAULT_MODEL=google/gemini-flash-1.5
+OPENAI_API_KEY=
+ANTHROPIC_API_KEY=
+OLLAMA_BASE_URL=http://localhost:11434