feat: complete backend — WorkflowBuilder, LoRAManager, Switchboard UI, 184 tests, ruff/mypy/env tooling

.env.example

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+# .env.example — RAINGOD ComfyUI Integration
+# Copy to .env and fill in your values.
+# This file is safe to commit — .env is excluded by .gitignore.
+
+# ============================================================
+# ComfyUI connection
+# ============================================================
+COMFYUI_HOST=127.0.0.1
+COMFYUI_PORT=8188
+
+# ============================================================
+# RAINGOD Backend
+# ============================================================
+BACKEND_HOST=0.0.0.0
+BACKEND_PORT=8000
+BACKEND_WORKERS=1
+
+# ============================================================
+# CORS — comma-separated list of allowed frontend origins
+# Restrict this before deploying publicly.
+# ============================================================
+ALLOWED_ORIGINS=http://localhost:3000,http://127.0.0.1:3000
+
+# ============================================================
+# LoRA directory (default: ./loras relative to project root)
+# ============================================================
+# RAINGOD_LORA_DIR=/path/to/ComfyUI/models/loras
+
+# ============================================================
+# Checkpoint override (default: v1-5-pruned-emaonly.safetensors)
+# ============================================================
+# RAINGOD_CHECKPOINT=dreamshaper_8.safetensors
+
+# ============================================================
+# Logging
+# ============================================================
+# LOG_LEVEL=INFO