Add Docker support with configuration files and environment setup

.env.example

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+# =====================================================
+# DECKERR DOCKER CONFIGURATION
+# =====================================================
+# Copy this file to .env and configure your settings
+#
+# Two deployment modes available:
+#   1. External Supabase: Use docker-compose.yml (simpler)
+#   2. Self-hosted Supabase: Use docker-compose.selfhosted.yml (full stack)
+# =====================================================
+
+# =====================================================
+# MODE 1: EXTERNAL SUPABASE (docker-compose.yml)
+# =====================================================
+# Use this if you have:
+# - A Supabase cloud account (supabase.com)
+# - A separately self-hosted Supabase instance
+# - Access to a paid hosted Supabase service
+
+# Your Supabase project URL
+VITE_SUPABASE_URL=https://your-project.supabase.co
+
+# Your Supabase anonymous/public key
+VITE_SUPABASE_ANON_KEY=your-anon-key-here
+
+# Port to run Deckerr on (default: 3000)
+PORT=3000
+
+
+# =====================================================
+# MODE 2: SELF-HOSTED SUPABASE (docker-compose.selfhosted.yml)
+# =====================================================
+# Use this to run everything locally, including Supabase
+
+# --- Site Configuration ---
+# Your domain or IP address (used for redirects)
+SITE_URL=http://localhost:3000
+
+# External API URL (Kong gateway)
+API_EXTERNAL_URL=http://localhost:8000
+
+# --- Port Configuration ---
+DECKERR_PORT=3000
+KONG_HTTP_PORT=8000
+KONG_HTTPS_PORT=8443
+POSTGRES_PORT=5432
+
+# --- Security Keys ---
+# IMPORTANT: Generate secure random values for production!
+# You can use: openssl rand -base64 32
+
+# PostgreSQL password
+POSTGRES_PASSWORD=your-super-secret-postgres-password
+
+# JWT Secret (must be at least 32 characters)
+# Generate with: openssl rand -base64 32
+JWT_SECRET=your-super-secret-jwt-token-with-at-least-32-characters
+
+# JWT Expiry in seconds (default: 3600 = 1 hour)
+JWT_EXPIRY=3600
+
+# Supabase Anonymous Key
+# Generate at: https://supabase.com/docs/guides/self-hosting#api-keys
+# Or use: npx @supabase/cli@latest gen key --type anon --jwt-secret "YOUR_JWT_SECRET"
+ANON_KEY=your-anon-key
+
+# Supabase Service Role Key (admin access)
+# Generate at: https://supabase.com/docs/guides/self-hosting#api-keys
+# Or use: npx @supabase/cli@latest gen key --type service_role --jwt-secret "YOUR_JWT_SECRET"
+SERVICE_ROLE_KEY=your-service-role-key
+
+# --- Email Configuration (Optional) ---
+# Required for email verification and password reset
+SMTP_HOST=smtp.example.com
+SMTP_PORT=587
+SMTP_USER=your-email@example.com
+SMTP_PASS=your-email-password
+SMTP_ADMIN_EMAIL=admin@example.com
+SMTP_SENDER_NAME=Deckerr
+
+# Enable email auto-confirm (set to true to skip email verification)
+ENABLE_EMAIL_AUTOCONFIRM=true
+
+# --- Feature Flags ---
+# Disable new user signups
+DISABLE_SIGNUP=false
+
+# Enable email signup
+ENABLE_EMAIL_SIGNUP=true
+
+# Enable anonymous users
+ENABLE_ANONYMOUS_USERS=false
+
+# --- Advanced ---
+# Additional redirect URLs (comma-separated)
+ADDITIONAL_REDIRECT_URLS=
+
+# PostgREST schemas
+PGRST_DB_SCHEMAS=public,graphql_public