docs: collapse duplicate README filtering paragraph

[YoungJinJung]

Summary

README.md carried the service-list filtering paragraph twice in a row (lines 476–477 on dbee17a). This was fallout from the browser PR merges — each merge resolved the paragraph against a different base, and one round left both copies in place.

Neither copy was complete:

	first copy	second copy
CloudFormation stacks	✅	❌
Auto Scaling groups	❌	✅
DynamoDB tables	❌	✅
EventBridge rules and targets	❌	✅

Changes

• Collapse to a single paragraph carrying the union of both coverage lists.
• Add the four filterable screens neither copy listed: security groups, CloudWatch alarms, CloudTrail events, KMS keys.

The additions were verified against the code, not guessed — each has both an activateFilter(<target>) and an updateSharedFilter(msg, <target>) call site, same as every other entry in the list.

Validation

• go build ./...
• go test ./... — all packages pass
• grep -c 'The service list defaults to favorites first' README.md → 1
• Scanned the rest of README.md for other duplicated long lines — none

Documentation only; no runtime behaviour changes.

Closes #317

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Reviewing files that changed from the base of the PR and between dbee17a and 732e7ae.

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• README.md

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[amazon-q-developer]

This documentation change correctly addresses the duplicate paragraph issue. The consolidated paragraph now includes all filterable screens from both original copies plus the four additional screens (security groups, CloudWatch alarms, CloudTrail events, KMS keys) that were missing from both. The change is accurate, improves documentation quality, and has no runtime impact. Ready to merge.

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[YoungJinJung]

Closing as a duplicate of #318, which was opened first and resolves #317 correctly (union of both coverage lists).

The one thing this PR had on top is posted as a suggestion on #318.

[YoungJinJung]

Reviewed head: 732e7ae

Low

• README.md:476 — The consolidated “Filtering is currently available…” list is still incomplete. At this head, the EC2 related-resource list uses filterEC2BrowserRelated (internal/app/screen_ec2_browser.go:196 and :208) and the Inspector checklist picker uses filterInspectorChecklistFiles (internal/app/screen_inspector.go:470 and :482); both render the shared filter with inline match highlighting, just like the screens named here. The authoritative coverage list therefore still hides supported filtering from users. Add these screens (for example, “EC2 inventory instances/related resources” and “Inspector checklist files”), or explicitly scope the sentence to exclude nested and picker screens.