feat(deploy): add PaaS templates and config

deploy/flyio/fly.toml

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+app = "flynn"
+
+[build]
+  dockerfile = "Dockerfile"
+
+[env]
+  # Persist state under /data (see volume mount below)
+  FLYNN_DATA_DIR = "/data"
+
+  # The Docker image ships /config/config.yaml (from config/paas.yaml).
+  # Override this if you mount your own config elsewhere.
+  FLYNN_CONFIG = "/config/config.yaml"
+
+[http_service]
+  internal_port = 18800
+  force_https = true
+  auto_start_machines = true
+  auto_stop_machines = "stop"
+  min_machines_running = 0
+
+[[mounts]]
+  source = "flynn_data"
+  destination = "/data"
+

deploy/railway/railway.toml

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+[build]
+builder = "DOCKERFILE"
+dockerfilePath = "Dockerfile"
+

deploy/render/render.yaml

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+services:
+  - type: web
+    name: flynn
+    env: docker
+    dockerfilePath: ./Dockerfile
+    autoDeploy: false
+    healthCheckPath: /
+    envVars:
+      - key: ANTHROPIC_API_KEY
+        sync: false
+