Clean up all timing/debug logs

Remove all [MCP-TIMING] and [CTRL-TIMING] log lines, timing middleware,
and related import time statements across 11 files.

gns3server/db/repositories/templates.py

@@ -53,22 +53,12 @@ class TemplatesRepository(BaseRepository):
         super().__init__(db_session)
 
     async def get_template(self, template_id: UUID) -> Union[None, models.Template]:
-        import time
-        _t0 = time.time()
 
         query = select(models.Template).\
             options(selectinload(models.Template.images)).\
             where(models.Template.template_id == template_id)
-        _t1 = time.time()
         result = await self._db_session.execute(query)
-        _t2 = time.time()
-        row = result.scalars().first()
-        _t3 = time.time()
-
-        if _t3 - _t0 > 0.1:
-            log.warning(f"[CTRL-TIMING] DB get_template SLOW template_id={template_id} "
-                        f"execute={_t2-_t1:.3f}s fetch={_t3-_t2:.3f}s total={_t3-_t0:.3f}s")
-        return row
+        return result.scalars().first()
 
     async def get_template_by_name_and_version(self, name: str, version: str) -> Union[None, models.Template]: