merge Dev/backend into main

[Linchen-Xu]

Context

Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.

Changes

Please list your changes here. For example:

• Add new tests

Screenshot (if applicated)

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
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
app.py	142	78	45%	47–48, 55–62, 67–97, 104, 108, 113, 117, 128, 133, 135, 140, 144, 153–175, 180–226, 231–249, 253
modules
evaluator.py	56	14	75%	96–97, 104–122
job_recommendation_system.py	29	22	24%	14–57
langgraph_qa.py	15	14	7%	2–30
neo4j_model.py	40	28	30%	36–78, 93–104, 110–111, 117–127, 136
parser.py	12	1	92%	20
recommendation_generator.py	25	21	16%	5, 8–38, 51
resume_processor.py	9	5	44%	21–25
retrieval_engine.py	34	25	26%	19–54, 68–103
upload.py	25	3	88%	23, 46–47
verify.py	9	9	0%	1–12
view.py	23	19	17%	5, 11–24, 30–35
TOTAL	419	239	43%

Tests	Skipped	Failures	Errors	Time
11	0 💤	0 ❌	0 🔥	42.624s ⏱️

[Linchen-Xu]

Closed due to conflicts. Resubmitting in #90