feat(translate-mcp): scaffold per-tenant translation MCP (CF-3122)

Node.js MCP server exposing translate/search_tm/upsert_glossary/record_correction
over StreamableHTTP on :9222. Routes translation calls to gemini-2.5-flash via
LiteLLM, augmented with per-tenant TM + glossary + tone profile from the
SmartTranslate pgvector DB.

Schema migration in sql/001_schema.sql already applied to smarttranslate DB.
Fleet registration in Infrastructure/litellm/config.yaml.

Refs: CF-3122 CF-3123 CF-3124 CF-3125

Dockerfile

@@ -0,0 +1,12 @@
+FROM node:22-slim
+
+WORKDIR /app
+
+COPY package.json ./
+RUN npm install --omit=dev
+
+COPY src/ src/
+
+EXPOSE 9222
+
+CMD ["node", "src/http-server.js"]