Fix Issue(title=...) TypeError in test_field_officer.py and restore detection.py startup fix

[Copilot]

Issue model has no title column, so the original test_field_officer.py raised TypeError at test collection time. A prior Netlify config commit (06f021b) also accidentally deleted the test file and re-introduced a NameError in detection.py that had already been fixed.

Description

backend/tests/test_field_officer.py — recreated with:

• Removed invalid title= kwarg from Issue(...) constructor; kept only real model fields (description, category, status, latitude, longitude)
• Added in-memory SQLite db_session fixture (creates/drops schema per test) and a client fixture that overrides get_db so the endpoint hits the test DB
• Added module-level mocks for heavy optional dependencies (google.generativeai, magic, telegram, speech_recognition, pydub, etc.) so backend.main imports cleanly in CI without those packages

backend/routers/detection.py — restored removal of undefined httpx.AsyncClient type hint on detect_emotion_endpoint. httpx is not imported in this module; the annotation caused a NameError at startup. The Depends(get_http_client) injection is unaffected.

# Before (broken — httpx not imported)
client: httpx.AsyncClient = backend.dependencies.Depends(get_http_client)

# After
client = backend.dependencies.Depends(get_http_client)

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🎨 Code style update (formatting, renaming)
• ♻️ Refactoring (no functional changes)
• ⚡ Performance improvement
• ✅ Test update

Related Issue

Testing Done

• Tested locally
• Added/updated tests
• All tests passing

Screenshots (if applicable)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Co-Authors

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Summary by cubic

Refines the field officer visit history lookup to reduce DB load and stabilize results. Adds a regression test for the endpoint (correct Issue model) and restores /api/detect-emotion client injection by removing the httpx.AsyncClient type in favor of get_http_client.

^{Written for commit 75dc2f0. Summary will update on new commits.}