feat(gateway): remove Jev (System One) analyzer, restore LLM-only text moderation

Jev (oc/jev-1.13-free via 9router /v1/systemone) added as primary text
analyzer was underperforming. Delete the whole feature:
- jevAnalyzer.ts + its unit & live-smoke tests
- Jev-first branch in textBatchProcessor, restore pure callModerationLLM path
- AI_LLM_JEV_* config vars (zod) and .env.example entries
- @typesafe-ai/sdk dependency (+ lockfile)

Behavior: text moderation is LLM-only again, exactly as before the
Jev feature; AGENTS.md invariant 'LLM is the only judge' holds.

services/discord-gateway/pnpm-lock.yaml

@@ -8,9 +8,6 @@ importers:
 
   .:
     dependencies:
-      '@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)
@@ -1090,10 +1087,6 @@ 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'}
@@ -2993,8 +2986,6 @@ snapshots:
     dependencies:
       '@types/node': 26.4.0
 
-  '@typesafe-ai/sdk@0.6.0': {}
-
   '@typescript/typescript-aix-ppc64@7.0.2':
     optional: true