feat(ift): EventHub AI Router stack for Zed

FastAPI gateway with A/B/C lane orchestration, LiteLLM proxy config,
Swarm stack (postgres, redis, VPN off-by-default), deploy/smoke/audit scripts.

litellm_config.yaml

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+# LiteLLM Proxy — Novita lanes A/B/C + Auto Router v2 fallback
+# Regenerate model_list tail: bash scripts/sync-routing-config.sh
+
+general_settings:
+  master_key: os.environ/LITELLM_MASTER_KEY
+  store_model_in_db: false
+  max_budget: 50
+  budget_duration: 30d
+
+litellm_settings:
+  drop_params: true
+  set_verbose: false
+  request_timeout: 120
+  num_retries: 2
+  cache: true
+  cache_params:
+    type: redis
+    host: redis
+    port: 6379
+    ttl: 3600
+  callbacks: ["prometheus"]
+  require_auth_for_metrics_endpoint: false
+
+environment_variables:
+  NOVITA_API_KEY: os.environ/NOVITA_API_KEY
+  GROQ_API_KEY: os.environ/GROQ_API_KEY
+  GEMINI_API_KEY: os.environ/GEMINI_API_KEY
+
+router_settings:
+  routing_strategy: simple-shuffle
+  num_retries: 2
+  timeout: 120
+  allowed_fails: 2
+  cooldown_time: 30
+  fallbacks:
+    - a-simple: ["b-simple", "groq-llama-8b"]
+    - a-medium-code: ["a-medium-ops", "groq-qwen-coder"]
+    - a-complex: ["b-complex", "a-reasoning"]
+    - b-complex: ["a-complex", "c-complex"]
+    - a-reasoning: ["b-reasoning", "gemini-flash"]
+    - a-vision: ["a-vision-ocr"]
+    - smart-router-internal: ["a-medium-ops", "a-medium-code", "a-complex"]
+  default_fallbacks: ["a-medium-code", "a-complex", "groq-qwen-coder"]
+
+model_list:
+  # --- Lane models (generated from config/model_matrix.yaml) ---
+  - model_name: a-simple
+    litellm_params:
+      model: novita/qwen/qwen3-4b-fp8
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 60
+  - model_name: b-simple
+    litellm_params:
+      model: novita/meta-llama/llama-3.1-8b-instruct
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 60
+  - model_name: c-simple
+    litellm_params:
+      model: novita/qwen/qwen3-8b-fp8
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 60
+
+  - model_name: a-medium-ops
+    litellm_params:
+      model: novita/qwen/qwen3-8b-fp8
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 40
+  - model_name: b-medium-ops
+    litellm_params:
+      model: novita/deepseek/deepseek-v3.2
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 40
+  - model_name: c-medium-ops
+    litellm_params:
+      model: novita/deepseek/deepseek-v3.2
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 40
+
+  - model_name: a-medium-code
+    litellm_params:
+      model: novita/qwen/qwen3-coder-30b-a3b-instruct
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 40
+  - model_name: b-medium-code
+    litellm_params:
+      model: novita/qwen/qwen3-coder-30b-a3b-instruct
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 40
+  - model_name: c-medium-code
+    litellm_params:
+      model: novita/qwen/qwen3-coder-30b-a3b-instruct
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 30
+
+  - model_name: a-complex
+    litellm_params:
+      model: novita/deepseek/deepseek-v3.2
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 30
+  - model_name: b-complex
+    litellm_params:
+      model: novita/deepseek/deepseek-r1-0528
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 20
+  - model_name: c-complex
+    litellm_params:
+      model: novita/deepseek/deepseek-r1-turbo
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 15
+
+  - model_name: a-reasoning
+    litellm_params:
+      model: novita/deepseek/deepseek-r1-0528-qwen3-8b
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 30
+  - model_name: b-reasoning
+    litellm_params:
+      model: novita/deepseek/deepseek-r1-0528
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 20
+  - model_name: c-reasoning
+    litellm_params:
+      model: novita/deepseek/deepseek-r1-turbo
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 15
+
+  - model_name: a-vision-ocr
+    litellm_params:
+      model: novita/paddlepaddle/paddleocr-vl
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 30
+  - model_name: a-vision
+    litellm_params:
+      model: novita/qwen/qwen3-vl-30b-a3b-instruct
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 20
+  - model_name: b-vision
+    litellm_params:
+      model: novita/qwen/qwen2.5-vl-72b-instruct
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 15
+  - model_name: c-vision
+    litellm_params:
+      model: novita/qwen/qwen3-vl-235b-a22b-instruct
+      api_key: os.environ/NOVITA_API_KEY
+      rpm: 10
+
+  # --- Optional fallbacks ---
+  - model_name: groq-llama-8b
+    litellm_params:
+      model: groq/llama-3.1-8b-instant
+      api_key: os.environ/GROQ_API_KEY
+  - model_name: groq-qwen-coder
+    litellm_params:
+      model: groq/qwen-qwen-2.5-coder-32b
+      api_key: os.environ/GROQ_API_KEY
+  - model_name: gemini-flash
+    litellm_params:
+      model: gemini/gemini-2.0-flash
+      api_key: os.environ/GEMINI_API_KEY
+
+  # --- Auto Router v2 fallback when gateway confidence low ---
+  - model_name: smart-router-internal
+    litellm_params:
+      model: auto_router/complexity_router
+      drop_params: true
+      complexity_router_default_model: a-medium-ops
+      complexity_router_config:
+        tiers:
+          SIMPLE: a-simple
+          MEDIUM: a-medium-ops
+          MEDIUM_CODE: a-medium-code
+          COMPLEX: a-complex
+          REASONING: a-reasoning
+        classifier_fallback: heuristic
+        keyword_tier_rules:
+          - keywords: ["привет", "hello", "hi", "thanks", "спасибо", "что такое", "what is", "define"]
+            tier: SIMPLE
+          - keywords: ["bash", "docker", "swarm", "ci/cd", "gitea", "rebar", "erlang", "devops", "kubectl", "terraform"]
+            tier: MEDIUM
+          - keywords: ["рефакторинг", "refactor", "архитектура", "architecture", "спроектируй", "migration plan"]
+            tier: COMPLEX
+          - keywords: ["step by step", "prove", "analyze deeply", "think through"]
+            tier: REASONING
+        custom_technical_keywords: [erlang, rebar3, traefik, mnesia, litellm, novita]
+        token_thresholds:
+          simple: 20
+          complex: 500
+        tier_boundaries:
+          simple_medium: 0.18
+          medium_complex: 0.38
+          complex_reasoning: 0.62
+        session_affinity: true
+        session_affinity_ttl_seconds: 1800
+
+  # Alias for Zed default model name (gateway resolves before LiteLLM)
+  - model_name: smart-router
+    litellm_params:
+      model: novita/qwen/qwen3-8b-fp8
+      api_key: os.environ/NOVITA_API_KEY