Add V1 infrastructure: Gitea Actions CI/CD + Fly.io + Cloudflare Pages

- Gitea Actions workflows: ci.yml (tests+clippy+fmt), benchmark.yml (P99 gate), deploy.yml (Fly+CF)
- Fly.io configs: proxy (shared-cpu, 256MB, min 1 machine), API (scale-to-zero)
- Dockerfiles: multi-stage Rust builds for proxy and API binaries
- INFRASTRUCTURE.md: full V1 stack (~$5/mo), AWS migration path, Gitea runner setup, DNS plan
- Stack: Fly.io + Cloudflare Pages + Neon + Upstash + Gitea Actions

products/01-llm-cost-router/fly.proxy.toml

@@ -0,0 +1,30 @@
+# Fly.io config — dd0c/route Proxy Engine
+app = "dd0c-route-proxy"
+primary_region = "iad"  # us-east (Virginia)
+
+[build]
+  dockerfile = "Dockerfile.proxy"
+
+[env]
+  RUST_LOG = "dd0c_route=info,tower_http=info"
+  PROXY_PORT = "8080"
+  AUTH_MODE = "local"
+  GOVERNANCE_MODE = "audit"
+  TELEMETRY_CHANNEL_SIZE = "1000"
+
+[http_service]
+  internal_port = 8080
+  force_https = true
+  auto_stop_machines = true
+  auto_start_machines = true
+  min_machines_running = 1
+
+  [http_service.concurrency]
+    type = "requests"
+    hard_limit = 250
+    soft_limit = 200
+
+[[vm]]
+  cpu_kind = "shared"
+  cpus = 1
+  memory_mb = 256