fix(api): add AbortSignal.timeout to unprotected fetch calls

[NewCoder3294]

Summary

• Add AbortSignal.timeout(15_000) to the two unprotected fetch() calls in server/worldmonitor/research/v1/list-tech-events.ts (ICS and RSS background fetches)
• Add AbortSignal.timeout(15_000) to the unprotected fetch() call in server/worldmonitor/displacement/v1/get-displacement-summary.ts (UNHCR Population API)
• These were the only fetch() calls in server/worldmonitor/ without a signal option; all other fetches already had timeout protection

Files modified

File	Timeout	Rationale
server/worldmonitor/research/v1/list-tech-events.ts	15_000 (15s)	ICS calendar + RSS feed — heavy payloads
server/worldmonitor/displacement/v1/get-displacement-summary.ts	15_000 (15s)	UNHCR JSON API — large paginated dataset

Test plan

• Verify list-tech-events still returns results when ICS/RSS sources are reachable
• Verify list-tech-events gracefully handles timeout (Promise.allSettled already handles rejection)
• Verify get-displacement-summary still returns UNHCR data normally
• Verify get-displacement-summary returns null on timeout (existing try/response check handles it)
• Run npm run typecheck — confirmed passing

🤖 Generated with Claude Code

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