feat: 多租户联动 — CMA切换企业注入tenant_id + a2a_dispatch分发

backend/app/api/tenant.py

@@ -0,0 +1,63 @@
+"""租户状态API — CMA系统切换公司时记录当前tenant，供项目Bot分发A2A任务"""
+from fastapi import APIRouter, Depends, HTTPException
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+from app.database import get_db
+from app.models import SystemConfig, Entity
+
+router = APIRouter(prefix="/api/cma/tenant", tags=["多租户"])
+
+TENANT_KEY = "current_tenant"
+
+class TenantSwitchRequest(BaseModel):
+    entity_id: int
+    source: str = "cma-system"
+
+
+def _tenant_name(entity_id: int) -> str:
+    """entity_id → tenant_id"""
+    return "company_b" if entity_id == 2 else "company_a"
+
+
+@router.get("/current")
+def get_current_tenant(db: Session = Depends(get_db)):
+    """查询当前租户"""
+    cfg = db.query(SystemConfig).filter(SystemConfig.config_key == TENANT_KEY).first()
+    if cfg and cfg.config_value:
+        import json
+        try:
+            return json.loads(cfg.config_value)
+        except:
+            pass
+    return {"tenant_id": "company_a", "entity_id": 1, "name": "陕西酣客文化传媒"}
+
+
+@router.post("/switch")
+def switch_tenant(data: TenantSwitchRequest, db: Session = Depends(get_db)):
+    """切换当前租户（CMA前端企业切换器调用）"""
+    ent = db.query(Entity).filter(Entity.id == data.entity_id).first()
+    if not ent:
+        raise HTTPException(404, "企业不存在")
+
+    import json
+    state = {
+        "tenant_id": _tenant_name(data.entity_id),
+        "entity_id": data.entity_id,
+        "name": ent.name,
+        "short_name": ent.short_name,
+        "source": data.source,
+        "switched_at": __import__("datetime").datetime.now().isoformat(),
+    }
+
+    cfg = db.query(SystemConfig).filter(SystemConfig.config_key == TENANT_KEY).first()
+    if cfg:
+        cfg.config_value = json.dumps(state, ensure_ascii=False)
+    else:
+        db.add(SystemConfig(
+            config_key=TENANT_KEY,
+            config_value=json.dumps(state, ensure_ascii=False),
+            description="当前租户状态（CMA企业切换联动）",
+        ))
+    db.commit()
+
+    return {"success": True, "current": state}