nledez / flask-fs2

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feat(swift): add Connection pool and configurable ETag mismatch policy

  - Per-process Connection pool (gevent Queue with stdlib fallback)
  so concurrent greenlets/threads no longer share a single
  swiftclient.Connection. Fixes sporadic 400s, ConnectionReset
  and content corruption under gevent workers.
  - write() pre-computes content_length and ETag and verifies
  the ETag returned by Swift. New etag_mismatch_policy config
  (log default / raise / raise_and_delete) controls
  behavior on mismatch — legacy log-only kept as default.
  - read_chunks() releases the borrowed Connection back to the
  pool when the generator is exhausted or close() is called.
  - list_files() uses full_listing=True to enumerate containers
  with more than 10 000 objects.
  - New optional settings: pool_size (20), pool_timeout (30),
  timeout (60), retries (5), os_options (merged over
  tenant_name / region_name for Keystone v3).
  - Tests: app fixture now pushes test_request_context and sets
  SERVER_NAME so url_for / current_app / request work
  out of the box; crypto tests use tmp_path instead of leaking
  encrypted.bin / decrypted.txt in cwd; new
  tests/test_swift_pool.py covers concurrent writes, pool sizing
  and ETag mismatch handling.
  - Adds gevent>=24.0.0 to test requirements.

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