fix: mypy + UI page-metadata sync for memory page

Two CI failures:

1. mypy: `_find_memory_for_caller` had `key_filter` inferred as
   `dict[str, str]` (literal type) and the conditional `{"AND": [key_filter, vis]}`
   returned `dict[str, list[...]]`, so the join site failed
   `dict-item` typing. Annotate both intermediates as `dict` so mypy
   widens the value type.

2. UI test (`page_utils.test.ts > should have descriptions for all
   pages`): every leftnav entry must have a description in
   `page_metadata.ts`, and `memory` was missing. Added a one-line
   description, matching the style of neighboring entries.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

litellm/proxy/memory/memory_endpoints.py

@@ -367,9 +367,9 @@ async def _find_memory_for_caller(
     prisma_client: Any, key: str, user_api_key_dict: UserAPIKeyAuth
 ) -> Any:
     """Look up a memory row by key, scoped to the caller's visibility."""
-    key_filter = {"key": key}
+    key_filter: dict = {"key": key}
     vis = _visibility_filter(user_api_key_dict)
-    where = key_filter if vis is None else {"AND": [key_filter, vis]}
+    where: dict = key_filter if vis is None else {"AND": [key_filter, vis]}
     rows = await prisma_client.db.litellm_memorytable.find_many(
         where=where, take=1, order={"updated_at": "desc"}
     )

ui/litellm-dashboard/src/components/page_metadata.ts

@@ -10,6 +10,7 @@ export const pageDescriptions: Record<string, string> = {
   models: "Configure and manage LLM models and endpoints",
   agents: "Create and manage AI agents",
   "mcp-servers": "Configure Model Context Protocol servers",
+  memory: "Inspect and manage agent memory entries stored under /v1/memory",
   guardrails: "Set up content moderation and safety guardrails",
   policies: "Define access control and usage policies",
   "search-tools": "Configure RAG search and retrieval tools",