chore: post-deployment cleanup and docs update

- Make AI routing rules DB-driven (read from system_configs, removed from config.py)
- Add translation quota tracking to LLM translation (OpenAIProvider)
- Add Alibaba MT ECS RAM role support (STS token, no AccessKey needed)
- Fix admin sidebar link for AI模型配置 page
- Fix Quota.vue API path (quotas → translation-quotas)
- Fix login auto-redirect to dashboard
- Add provider dropdown selects to AI routing config UI
- Clean up stale ai_provider_* system_configs records
- Remove OpencodeGo, Spark providers (code + DB)
- Update deploy config: nginx port 8000, systemd cwd

backend/app/services/admin.py

@@ -288,11 +288,14 @@ class AdminService:
 
     async def _seed_default_configs(self):
         defaults = [
-            SystemConfig(key="ai_provider_translate", value={"primary": "sensenova", "fallback": ["alibaba-mt", "opencode_go"]}, description="翻译任务 AI 模型选择"),
-            SystemConfig(key="ai_provider_reply", value={"primary": "sensenova", "fallback": ["opencode_go"]}, description="回复建议 AI 模型选择"),
-            SystemConfig(key="ai_provider_marketing", value={"primary": "sensenova", "fallback": ["opencode_go"]}, description="营销文案 AI 模型选择"),
-            SystemConfig(key="ai_provider_extract", value={"primary": "sensenova", "fallback": ["opencode_go"]}, description="信息提取 AI 模型选择"),
-            SystemConfig(key="ai_provider_quotation", value={"primary": "sensenova", "fallback": ["opencode_go"]}, description="报价单 AI 模型选择"),
+            SystemConfig(key="ai_routing", value={
+                "translate": {"primary": "sensenova", "fallback": ["alibaba-mt", "nvidia"]},
+                "reply": {"primary": "sensenova", "fallback": ["nvidia"]},
+                "marketing": {"primary": "sensenova", "fallback": ["nvidia"]},
+                "extract": {"primary": "sensenova", "fallback": ["nvidia"]},
+                "quotation": {"primary": "sensenova", "fallback": ["nvidia"]},
+                "chat": {"primary": "sensenova", "fallback": ["nvidia"]},
+            }, description="AI 路由规则：各任务的主选/备用供应商"),
             SystemConfig(key="feature_guest_mode", value={"enabled": True}, description="游客模式开关"),
             SystemConfig(key="feature_wechat_login", value={"enabled": False}, description="微信登录开关"),
             SystemConfig(key="feature_registration", value={"enabled": True}, description="新用户注册开关"),
@@ -305,6 +308,19 @@ class AdminService:
             self.db.add(cfg)
         await self.db.flush()
 
+    async def _migrate_routing_configs(self):
+        from sqlalchemy import delete
+        # Remove stale individual routing keys (replaced by consolidated ai_routing)
+        stale_prefixes = ["ai_provider_translate", "ai_provider_reply", "ai_provider_marketing",
+                          "ai_provider_extract", "ai_provider_quotation"]
+        for key in stale_prefixes:
+            await self.db.execute(
+                delete(SystemConfig).where(SystemConfig.key == key)
+            )
+        if stale_prefixes:
+            await self.db.flush()
+            logger.info("Cleaned up stale ai_provider_* routing configs")
+
     async def list_config(self) -> List[Dict[str, Any]]:
         result = await self.db.execute(
             select(func.count(SystemConfig.id))
@@ -312,6 +328,28 @@ class AdminService:
         if result.scalar() == 0:
             await self._seed_default_configs()
 
+        await self._migrate_routing_configs()
+
+        # Ensure consolidated ai_routing exists
+        result = await self.db.execute(
+            select(SystemConfig).where(SystemConfig.key == "ai_routing")
+        )
+        if not result.scalar_one_or_none():
+            self.db.add(SystemConfig(
+                key="ai_routing",
+                value={
+                    "translate": {"primary": "sensenova", "fallback": ["alibaba-mt", "nvidia"]},
+                    "reply": {"primary": "sensenova", "fallback": ["nvidia"]},
+                    "marketing": {"primary": "sensenova", "fallback": ["nvidia"]},
+                    "extract": {"primary": "sensenova", "fallback": ["nvidia"]},
+                    "quotation": {"primary": "sensenova", "fallback": ["nvidia"]},
+                    "chat": {"primary": "sensenova", "fallback": ["nvidia"]},
+                },
+                description="AI 路由规则：各任务的主选/备用供应商",
+            ))
+            await self.db.flush()
+            logger.info("Seeded ai_routing config")
+
         result = await self.db.execute(
             select(SystemConfig).order_by(SystemConfig.key)
         )
@@ -336,6 +374,12 @@ class AdminService:
         config.value = value
         config.updated_at = datetime.utcnow()
         await self.db.flush()
+
+        if key == "ai_routing":
+            from app.ai.router import get_ai_router
+            await get_ai_router().reload_from_db(self.db)
+            logger.info("AI router reloaded after ai_routing config update")
+
         return {
             "key": config.key,
             "value": config.value,

backend/app/services/translation_quota.py

@@ -12,6 +12,10 @@ class TranslationQuotaService:
     def __init__(self, db: AsyncSession):
         self.db = db
 
+    def _default_desc(self, version: str) -> str:
+        labels = {"ecommerce": "阿里云翻译电商版", "general": "阿里云翻译通用版", "llm": "AI模型翻译"}
+        return labels.get(version, f"阿里云翻译{version}版")
+
     async def _get_or_create(self, version: str) -> TranslationQuota:
         result = await self.db.execute(
             select(TranslationQuota).where(TranslationQuota.version == version)
@@ -25,7 +29,7 @@ class TranslationQuotaService:
                 used_chars=0,
                 current_month=now.strftime("%Y-%m"),
                 enabled=True,
-                description=f"阿里云翻译{version}版",
+                description=self._default_desc(version),
             )
             self.db.add(quota)
             await self.db.flush()
@@ -57,8 +61,7 @@ class TranslationQuotaService:
         return remaining
 
     async def get_all_quotas(self) -> list:
-        default_versions = ["ecommerce", "general"]
-        for v in default_versions:
+        for v in ("ecommerce", "general", "llm"):
             await self._get_or_create(v)
 
         result = await self.db.execute(select(TranslationQuota).order_by(TranslationQuota.version))