docs: update .env.example with correct OAuth config

- Added BASE_URL explanation (used for all OAuth providers)
- Fixed callback URL paths (/auth/{provider}/callback)
- Removed unused individual REDIRECT_URI vars

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

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: JacobCoffee

.env.example

@@ -0,0 +1,93 @@
+# scribbl-py Environment Configuration
+# Copy this file to .env and update the values
+
+# =============================================================================
+# Application Settings
+# =============================================================================
+LITESTAR_APP=scribbl_py.app:app
+DEBUG=true
+
+# =============================================================================
+# Database Configuration
+# =============================================================================
+# SQLite (default - good for development)
+DATABASE_URL=sqlite+aiosqlite:///./scribbl.db
+
+# PostgreSQL (recommended for production)
+# DATABASE_URL=postgresql+asyncpg://user:password@localhost:5432/scribbl
+
+# =============================================================================
+# OAuth Providers (optional - for user authentication)
+# =============================================================================
+# BASE_URL is used to construct OAuth callback URLs for ALL providers:
+#   {BASE_URL}/auth/discord/callback
+#   {BASE_URL}/auth/google/callback
+#   {BASE_URL}/auth/github/callback
+#
+# For local development, leave unset (defaults to http://localhost:8000)
+# For production, set to your domain (e.g., https://scribble.scriptr.dev)
+BASE_URL=http://localhost:8000
+
+# Google OAuth
+# Get credentials at: https://console.cloud.google.com/apis/credentials
+# Add redirect URI: {BASE_URL}/auth/google/callback
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+
+# Discord OAuth
+# Get credentials at: https://discord.com/developers/applications
+# Add redirect URI: {BASE_URL}/auth/discord/callback
+DISCORD_CLIENT_ID=
+DISCORD_CLIENT_SECRET=
+
+# GitHub OAuth
+# Get credentials at: https://github.com/settings/developers
+# Add redirect URI: {BASE_URL}/auth/github/callback
+GITHUB_CLIENT_ID=
+GITHUB_CLIENT_SECRET=
+
+# =============================================================================
+# Telemetry & Analytics (optional)
+# =============================================================================
+
+# Sentry - Error tracking and performance monitoring
+# Get DSN at: https://sentry.io/
+SENTRY_DSN=
+SENTRY_TRACES_RATE=0.1
+SENTRY_PROFILES_RATE=0.1
+ENVIRONMENT=development
+
+# PostHog - Product analytics
+# Get API key at: https://posthog.com/
+POSTHOG_API_KEY=
+POSTHOG_HOST=https://app.posthog.com
+
+# =============================================================================
+# Session & Security
+# =============================================================================
+# Secret key for session encryption (generate with: python -c "import secrets; print(secrets.token_hex(32))")
+SESSION_SECRET_KEY=change-me-in-production
+
+# =============================================================================
+# Rate Limiting
+# =============================================================================
+# Set to "false" to disable rate limiting
+RATE_LIMIT_ENABLED=true
+# Default requests per minute (applies to all endpoints not otherwise configured)
+RATE_LIMIT_PER_MINUTE=100
+# API requests per minute
+RATE_LIMIT_API_PER_MINUTE=60
+# Auth requests per minute (lower to prevent brute force)
+RATE_LIMIT_AUTH_PER_MINUTE=20
+
+# =============================================================================
+# Task Queue (Huey)
+# =============================================================================
+# Set to "false" to disable task queue
+TASK_QUEUE_ENABLED=true
+# Path to Huey's SQLite database for task storage
+TASK_QUEUE_DB_PATH=./huey_tasks.db
+# Set to "true" for immediate task execution (testing only)
+TASK_QUEUE_IMMEDIATE=false
+# Days to retain old canvases before cleanup (default: 30)
+CANVAS_RETENTION_DAYS=30