server: (router) add model management API (#23976)

* wip

* server: (router) add SSE realtime updates API

* nits

* wip

* add download API

* add download api

* update docs

* add delete endpoint

* fix std::terminate

* fix crash

* fix 2

* add tests

* nits

tools/server/tests/utils.py

@@ -340,6 +340,9 @@ class ServerProcess:
         elif method == "POST":
             response = requests.post(url, headers=headers, json=data, timeout=timeout)
             parse_body = True
+        elif method == "DELETE":
+            response = requests.delete(url, headers=headers, timeout=timeout)
+            parse_body = True
         elif method == "OPTIONS":
             response = requests.options(url, headers=headers, timeout=timeout)
         else: