Integration test: API facts endpoints (FastAPI TestClient + Redis)

[berendt]

What

Integration coverage for the read-only inventory-facts HTTP endpoints, which
read straight from Redis:

• GET /v1/inventory/hosts/{host}/facts (osism/api.py:927)
• GET /v1/inventory/hosts/{host}/facts/{fact} (osism/api.py:966)

Both call utils.redis.get("ansible_facts{host}"). Driving them through
fastapi.testclient.TestClient against the live Redis exercises the API↔Redis
read path end-to-end. The suite is skipped automatically when Redis is not
reachable, like the other modules under tests/integration/.

Part of #2400. Follow-up to #2368.

Changes (in commit order)

1. Add httpx to dev dependencies for FastAPI TestClient — fastapi.testclient.TestClient
   needs httpx as its transport. Adds httpx = "==0.28.1" to [dev-packages]
   and regenerates Pipfile.lock so pipenv install --dev --deploy keeps
   verifying the lock in CI. The lock diff adds only httpx and its transitives
   (httpcore, h11, anyio, sniffio, idna, certifi, typing-extensions)
   to develop; no runtime pins move.

2. Add integration tests for inventory facts API endpoints — new module
   tests/integration/test_api_facts.py. Each test seeds the exact
   ansible_facts<host> key (UUID-based host) and deletes it in teardown.
   Covers every Scope item from the issue:

   • parsed facts returned with the correct count and from_cache flag;
   • a single fact value;
   • unknown fact → 404;
   • unknown host → 404 (both endpoints);
   • malformed JSON in Redis → 500.

Notes

• Importing osism.api wires the event bridge to Redis at import time, so the
  import is deferred into the client fixture — fine in the integration env
  where Redis is up (and the suite is skipped without it).
• The README "Running integration tests" overview sentence is shared by all
  Meta: Extend Celery/Redis integration tests (Tier 1 + Tier 2) #2400 siblings; it is intentionally left untouched here to avoid per-issue
  merge churn. The existing warning block already covers the per-run UUID keys.

Test plan

• CI runs tests/integration with a live Redis (playbooks/test-integration.yml,
  OSISM_REQUIRE_REDIS=1). Per repo convention the tests run in CI, not locally.
• Verified locally: pipenv verify (lock in sync) and flake8 on the new file.

Closes #2406

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Implemented by planwerk-review f1c04d7 with Claude:claude-opus-4-8

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