test(account): add auth coverage and state verification for account delection

[sanket1035]

Description

Resolves #174.

Hardens TestDeleteAccount in backend/tests/test_account.py by adding negative authorization tests and deep state verification for account deletion.

Changes Included:

• backend/tests/test_account.py:
  • Refactored test_delete_account_success to create dummy cycles, symptoms, and moods prior to account deletion, execute DELETE /delete-account, and verify that GET endpoints (/cycles, /symptoms, /moods) return empty arrays and RAM state is completely purged.
  • Added test_delete_account_no_auth: Verifies HTTP 401 response when Authorization header is missing in production mode.
  • Added test_delete_account_invalid_token: Verifies HTTP 401 response when Authorization header contains an invalid/expired token.
• backend/app.py:
  • Updated mock state cleanup in delete_account() and get_symptoms() to ensure state is reset cleanly.

How to Test

Run pytest from backend/:

pytest tests/test_account.py

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