Initial open-source release (MIT): image2api AI gateway

Full Go backend + Vue 3 frontend, OpenAI-compatible API, multi-provider
account pools, billing/admin, Docker one-command deploy with auto HTTPS.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/.env.example

@@ -0,0 +1,20 @@
+# Vivid AI backend config template. Copy to .env and fill in real values.
+# Real environment variables override .env.
+
+APP_ENV=development
+APP_TITLE=Vivid AI
+HTTP_ADDR=:6666
+
+# PostgreSQL (database must already exist; tables auto-migrate on boot)
+POSTGRES_DSN=host=127.0.0.1 user=postgres password=YOUR_PASSWORD dbname=vivid_ai port=5432 sslmode=disable TimeZone=Asia/Shanghai
+
+# Redis
+REDIS_ADDR=127.0.0.1:6379
+REDIS_PASSWORD=
+REDIS_DB=0
+
+# Frontend dev origins allowed for CORS
+CORS_ORIGINS=http://localhost:5173,http://127.0.0.1:5173
+
+# Optional: override generated media root (defaults to ../../ai-gateway/data/generated)
+# GENERATED_ROOT=