feat: Add job_engine with browser-use and HITL logic

[LakshinG]

Added the "Pause & Learn" Job Engine project within the job_engine/ subdirectory.
This integrates browser-use with Gemini 1.5 Flash to automatically complete job applications from a queue. Features include:

• A local knowledge base (answers.json) for filling form fields.
• A Human-in-the-Loop custom tool that strictly verifies known answers via an LLM. It logs unknown fields (confidence <95%) to pending_questions.json and immediately aborts the application to prevent guessing.
• A human jitter delay tool to simulate real user pacing and avoid bot detection.
• Setup instructions and dependencies in requirements.txt, alongside scripts configured for a specified Windows Chrome profile.

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PR created automatically by Jules for task 11962163433764657325 started by @LakshinG

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