fix(post-3.5c): nemoton dispatcher IP 殘留集中化

餘震 C-1：
- services/nemoton_dispatcher_service.py:287 env fallback hardcoded
  192.168.0.111，違反 ADR-008 集中化原則
- 改從 config.HERMES_URL 集中讀取

Out-of-scope finding（不在本次修復範圍）：
- line 286 仍寫死 "qwen2.5:7b-instruct"，但實際模型是 hermes3:latest
  （與 hermes_analyst_service.py:30 不一致，應由後續 PR 處理）

services/nemoton_dispatcher_service.py

@@ -26,6 +26,8 @@ from typing import Optional
 import requests
 from services.mcp_context_service import build_mcp_context
 
+from config import HERMES_URL  # ADR-008 集中化：禁止硬編碼 IP
+
 logger = logging.getLogger(__name__)
 
 
@@ -284,7 +286,7 @@ def _build_footprint_json(hermes_stats: Optional[dict], nim_stats: Optional[dict
     if hermes_stats:
         result["analyst"] = {
             "model":        "qwen2.5:7b-instruct",
-            "host":         os.getenv("HERMES_URL", "http://192.168.0.111:11434"),
+            "host":         HERMES_URL,  # ADR-008：集中讀取，禁止硬編碼 IP
             "duration_sec": hermes_stats.get("duration_sec", 0),
             "tokens":       hermes_stats.get("tokens", 0),
             "cost_usd":     0,