Add QCon conference data

[TerryFYL]

Summary

• add QCon to the conference tracker with C4Media as organizer
• use conservative speaker-policy values where no public SEA or general speaker-fee commitment is published
• mark expense reimbursement as Partial based on public QCon speaker hotel/accommodation information, without treating that as a current full travel reimbursement commitment

Sources

• QCon conference family: https://qconferences.com/
• C4Media organizer page: https://c4media.com/
• Public QCon speaker information reference for hotel/accommodation support: https://qconnewyork.com/ny2012/qcon-nyc-2012/speakerinformation/index.html

Verification

• Checked README table row has 6 data cells / 7 pipe characters
• Checked source URLs return HTTP 200
• Ran git diff --check

Demo Note

Data-only Markdown update; no runnable UI/demo video applies.

/claim #11

Disclosure: This PR was implemented with AI assistance and manually reviewed/tested before submission.