feat: Add Google Cloud Storage CDN for models.soulcraft.com

- Primary source: models.soulcraft.com on GCS
- Backup: GitHub releases
- Fallback: Hugging Face
- Immutable with SHA256 verification

deploy/models-cdn/wrangler.toml

@@ -0,0 +1,34 @@
+name = "brainy-models-cdn"
+main = "src/index.ts"
+compatibility_date = "2024-01-01"
+
+# Custom domain
+routes = [
+  { pattern = "models.soulcraft.com/*", zone_name = "soulcraft.com" }
+]
+
+# KV namespace for model storage
+kv_namespaces = [
+  { binding = "MODELS", id = "brainy_models_kv" }
+]
+
+# R2 bucket for large model files
+r2_buckets = [
+  { binding = "MODEL_BUCKET", bucket_name = "brainy-models" }
+]
+
+[env.production]
+vars = { ENVIRONMENT = "production" }
+
+# Cache everything for 1 year (models never change)
+[site]
+bucket = "./models"
+
+[build]
+command = "npm install && npm run build"
+
+# Durable Objects for download tracking
+[[durable_objects.bindings]]
+name = "DOWNLOAD_TRACKER"
+class_name = "DownloadTracker"
+script_name = "download-tracker"