Fix LXC deploy: absolute paths + systemd section for StartLimit

Service was crashing on every boot because vetting.example.yaml uses
./var/... relative paths that resolve to / under ProtectSystem=strict.
Ship a separate vetting.production.yaml with absolute /var/lib/vetting
+ /var/log/vetting paths that match the unit's ReadWritePaths, and
have install.sh copy that one. Also move StartLimit* keys into [Unit]
to silence the 'Unknown key' warning on modern systemd.

deploy/vetting.production.yaml

@@ -0,0 +1,81 @@
+server:
+  # Loopback-only by default; change to "0.0.0.0:8080" (or similar) once
+  # you've wired up TLS or fronted the service with a reverse proxy.
+  bind: "127.0.0.1:8080"
+  # Base URL the orchestrator is reachable at from the operator's
+  # browser. Used as the click-through link in notifications.
+  public_url: "http://127.0.0.1:8080"
+  tls:
+    enabled: false
+    cert_file: ""
+    key_file: ""
+
+database:
+  path: "/var/lib/vetting/vetting.db"
+
+artifacts:
+  dir: "/var/lib/vetting/artifacts"
+  # Days to keep per-run artifact files (report.html, report.json, fio,
+  # iperf, inventory.json, hold keys). DB rows are preserved. 0 = forever.
+  retention_days: 30
+
+logs:
+  dir: "/var/log/vetting"
+  # Days to keep per-run log files. 0 = forever.
+  retention_days: 30
+
+janitor:
+  # Interval between cleanup sweeps. 0 defaults to 60.
+  interval_minutes: 60
+
+auth:
+  # bcrypt hash of your admin password.
+  # Generate via: gen-admin-password 'your-password'
+  admin_password_bcrypt: "$2a$10$REPLACE_ME_WITH_A_REAL_BCRYPT_HASH_0123456789abcdefABCDEFxx"
+  # Random 32-byte hex string used to sign session cookies.
+  # Generate via: openssl rand -hex 32
+  session_secret_hex: "0000000000000000000000000000000000000000000000000000000000000000"
+  session_ttl_hours: 24
+
+dispatcher:
+  max_concurrent_runs: 3
+
+pxe:
+  enabled: false
+  interface: ""                          # e.g. "eth0"
+  dhcp_range: ""                         # e.g. "10.77.0.100,10.77.0.200,12h"
+  orchestrator_url: ""                   # e.g. "http://10.77.0.1:8080"
+  tftp_root: "/var/lib/vetting/tftp"     # holds ipxe.efi + undionly.kpxe
+  live_dir: "/var/lib/vetting/live"      # holds vmlinuz + initrd.img; served at /live/*
+
+# Notifications fire on StageFailed, SpecMismatch, HoldingOpened,
+# RunCompleted. Declare one or more notifiers and route each event
+# kind (and optionally severity) to a notifier by name. Delivery is
+# fire-and-forget (one attempt per event, logged on failure).
+#
+# Example (uncomment and fill in):
+#
+# notifiers:
+#   - name: ops-ntfy
+#     type: ntfy
+#     server: https://ntfy.sh
+#     topic: vetting-YOUR-TOPIC
+#   - name: ops-discord
+#     type: discord
+#     webhook_url: https://discord.com/api/webhooks/XXX/YYY
+#   - name: ops-email
+#     type: smtp
+#     smtp:
+#       host: mail.lan
+#       port: 25
+#       from: vetting@lan.local
+#       to: [ops@lan.local]
+#
+# routes:
+#   - match_severity: [critical]
+#     notifier: ops-ntfy
+#   - match_kind: [RunCompleted]
+#     notifier: ops-ntfy
+
+notifiers: []
+routes: []