fix: extract company/location from JD file instead of using filename

[jaimax0401]

Fix Resume-Job Linking & Data Consistency Issues (Item 1)

Issue: #57 — Fix Resume-Job Linking & Data Consistency Issues

Problem

• job_listing_id was always null because job title was derived from the filepath stem (e.g., job_listing.md → "job_listing") instead of the actual job title in the JD content
• Company field was always empty — never extracted from the JD markdown
• Location field was also never extracted

Fix

Parse the saved JD markdown file (after fetching) to extract:

• Title from # heading line
• Company from **Company:** company_name line
• Location from **Location:** location line

Then create the JobListing entry with actual parsed metadata instead of empty defaults.

Files Changed

• src/tailor_from_url.py: Added JD file parsing step before creating JobListing entry

Acceptance Criteria

• Job listing entry has correct title (from # heading in markdown)
• Job listing entry has correct company (from **Company:** in markdown)
• Job listing entry has correct location (from **Location:** in markdown)
• job_listing_id is no longer null when resumes are saved
• Bi-directional linking works (resume → job listing, job listing → resume)