feat(gateway): Jev (System One) as primary text moderator with LLM fallback (#80)

* feat(gateway): Jev (System One) as primary text moderator with LLM fallback

Add TypeSafe Jev via @typesafe-ai/sdk v0.6.0 as the PRIMARY analyzer for
text-only moderation sub-batches; the existing LLM stays as the fallback
for anything Jev cannot decide confidently (per-message gate rejection or
API failure) and for media batches.

- jevAnalyzer.ts: TypeSafeClient wrapper, declarative state builder
  (System One models MUST get factual state, not chat-XML — chat framing
  made Jev confidently wrong on clean messages at 0.98 confidence),
  message-id-keyed question builder (5 typed questions per message),
  cross-consistency acceptance gate (noul↔status↔severity↔action↔category),
  answer→AnalysisResult mapper, fail-open outcome.
- textBatchProcessor.ts: Jev-first per sub-batch, rejected ids + API
  failures fall back to callModerationLLM; no cross-batch pollution.
- config: AI_LLM_JEV_ENABLED/API_KEY/BASE_URL/MODEL/TIMEOUT_MS/MIN_CONFIDENCE.
- .env.example: documented all 6 Jev env vars.
- tests: unit (question/state builders, gate, mapper) + live smoke
  (gated behind AI_LLM_JEV_SMOKE=1) verified 4/4 accepted vs real 9router.

* fix: auto-fix code quality [skip ci]

services/discord-gateway/pnpm-lock.yaml

@@ -17,6 +17,9 @@ importers:
       '@snazzah/davey':
         specifier: ^0.1.11
         version: 0.1.12(@emnapi/core@1.11.3)(@emnapi/runtime@1.11.3)
+      '@typesafe-ai/sdk':
+        specifier: ^0.6.0
+        version: 0.6.0
       axios:
         specifier: ^1.20.0
         version: 1.20.0(debug@4.4.3(supports-color@7.2.0))(supports-color@7.2.0)
@@ -1203,6 +1206,10 @@ packages:
   '@types/ws@8.18.1':
     resolution: {integrity: sha512-ThVF6DCVhA8kUGy+aazFQ4kXQ7E1Ty7A3ypFOe0IcJV8O/M511G99AW24irKrW56Wt44yG9+ij8FaqoBGkuBXg==}
 
+  '@typesafe-ai/sdk@0.6.0':
+    resolution: {integrity: sha512-IddX+Q0XM+VagOUZFeP7wZjaO4SHMdvnh2zEBdrZZnXedWI3BNK1lKhMx3ayrkFWvVLbVcUHJy6AVZlY+e6Jaw==}
+    engines: {node: '>=20'}
+
   '@typescript/typescript-aix-ppc64@7.0.2':
     resolution: {integrity: sha512-MTKKkWB7p/0E9xi1d1tHtZ5PiLkGEMIq88pK2CubZjOsLtYTLqhgIgi6zepFa+9GHZ6h05NMCkQxGKiPXMxXtQ==}
     engines: {node: '>=16.20.0'}
@@ -3218,6 +3225,8 @@ snapshots:
     dependencies:
       '@types/node': 26.4.0
 
+  '@typesafe-ai/sdk@0.6.0': {}
+
   '@typescript/typescript-aix-ppc64@7.0.2':
     optional: true