[zhenyuan992]

What this fixes

Fiji previously used a 10-second read timeout for every bridge request. ROI import is a synchronous FLIMKit UI-thread mutation and cannot be cancelled safely. If it took longer than 10 seconds, Fiji could report a timeout while the ROI import later completed, making a retry unsafe.

This change:

• keeps the 10-second read timeout for image GET requests
• disables the read timeout for ROI POST requests so Fiji waits for the final result
• adds a fast source regression for the request-specific timeout
• delays the real Fiji ROI import by 11 seconds to prove the old timeout boundary is crossed safely
• corrects the README's verified test count

Verification

• real Fiji with an 11-second delayed ROI import: 29 passed
• suite without Fiji: 28 passed, 1 skipped
• Python compilation: passed
• git diff --check: passed

Scope

This is a focused follow-up to merged PR #2. It does not change image transport, authentication, ROI payloads, or server binding behavior.