feat(core): register tax router in main.py

app/main.py

@@ -38,6 +38,7 @@ from app.routes import (
     users,
     workflows,
     currencies,
+    taxes,
 )
 
 
@@ -188,6 +189,7 @@ def create_app() -> FastAPI:
     app.include_router(ai_copilot.router)
     app.include_router(workflows.router)
     app.include_router(currencies.router)
+    app.include_router(taxes.router)
 
     # ── Register plugin routes (before SPA catch-all) ────────────────
     registry = get_registry()