Add offline-safe GitHub Actions CI for backend test reliability (Bepo v0.4.1)

[Copilot]

This PR adds a minimal GitHub Actions pipeline so backend tests run automatically on PRs and pushes to main, with explicit safeguards to prevent CLIP/Hugging Face model downloads in CI. It also tightens test/runtime documentation and dependency setup around isolated, local-state-independent test execution.

• CI pipeline (.github/workflows/ci.yml)

  • Adds workflow Bepo CI
  • Triggers on:
    • pull_request
    • push to main
  • Runs on ubuntu-latest with Python 3.11
  • Installs runtime + dev test dependencies and executes python -m pytest tests/ -v
  • Sets explicit minimal workflow token permissions (contents: read)

• Offline model-download guardrails

  • CI exports:
    • TRANSFORMERS_OFFLINE=1
    • HF_HUB_OFFLINE=1
  • Preserves existing test strategy that monkeypatches CLIP initialization to avoid network/model fetch paths

• Test isolation hardening

  • tests/test_api.py fixture now also sets offline env vars defensively
  • Tests continue to run against temp DB_PATH and temp IMAGES_DIR, independent of local memories.db, images/, GUI, or a pre-running backend server

• Dependency and docs alignment

  • Adds requirements-dev.txt with pytest and httpx
  • README testing section updated to use dev requirements and clarify that tests use temporary DB/files and disable model downloads
  • README now documents CI coverage on PR/push

# .github/workflows/ci.yml (excerpt)
env:
  TRANSFORMERS_OFFLINE: "1"
  HF_HUB_OFFLINE: "1"

steps:
  - uses: actions/setup-python@v5
    with:
      python-version: "3.11"
  - run: |
      python -m pip install --upgrade pip
      pip install -r requirements.txt
      pip install -r requirements-dev.txt
      python -m pytest tests/ -v

[Copilot]

Pull request overview

This PR introduces an offline-safe GitHub Actions CI workflow to automatically run the backend test suite on PRs and pushes to main, while hardening tests against accidental Hugging Face/Transformers model downloads.

Changes:

• Added a minimal GitHub Actions workflow that installs dependencies and runs python -m pytest tests/ -v with offline HF/Transformers env vars set.
• Added requirements-dev.txt for test dependencies.
• Updated tests and README to reinforce offline/no-model-download and isolated temp DB/filesystem behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
tests/test_api.py	Sets TRANSFORMERS_OFFLINE/HF_HUB_OFFLINE in the autouse fixture to defensively prevent model downloads during tests.
requirements-dev.txt	Adds dev-only test dependencies (pytest, httpx).
README.md	Updates test instructions and documents CI behavior + offline guardrails.
.github/workflows/ci.yml	Adds CI workflow to run pytest on PRs and pushes to main with offline environment variables.

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