Substantial reduction (~765 LOC) without changing the security
boundary:
* Drop ContainerOwnershipStore and LiteLLMSkillsStore — both were
one-method-per-Prisma-call wrappers. Inline the calls instead,
matching the established pattern in vector_store_endpoints,
agent_endpoints, and mcp_server/db.py.
* Drop the prisma_client is None in-memory fallback. Production
deploys always have Prisma; running ownership-critical paths on a
process-local dict is a security footgun in the dev-mode case it
was meant to support, and complicates every code path with a
branch. Fail-secure: skip recording if Prisma is unavailable, and
treat reads as "not found" (admin-only).
* Drop the hand-rolled module-level cache. Replace with the existing
litellm.caching.in_memory_cache.InMemoryCache, which already has
TTL + max-size + eviction tested in its own module. Sentinel string
for negative caching since InMemoryCache can't disambiguate "miss"
from "cached as None".
* Tests: drop coverage for removed code paths (in-memory fallback,
hand-rolled cache internals). Keep tests for actual behavior (cache
hit-rate, negative caching, owner check, list filtering,
identity-less reject, admin bypass).
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