fix: resolve broken links in link checker

[balhar-jakub]

Summary

Fixes 7 pre-existing broken links across 5 files that cause the CI link checker to fail on master.

Changes

🔴 Fixed internal link errors

File	What was broken	Fix
docs/troubleshoot/app-framework/appserver-error-codes.md	certificate-configuration-scenarios.md (wrong filename — should be plural)	→ certificates-configuration-scenarios.md (2 occurrences, also fixed fragment to match actual heading)
docs/user-guide/zos-preflight.md	Link to commands/internal/start/prepare/index.ts (TypeScript source file, not a doc page)	→ ../appendix/zwe_server_command_reference/zwe/internal/start/zwe-internal-start-prepare.md

🟡 Fixed live docs.zowe.org 404s

File	Broken URL	Fix
docs/troubleshoot/cli/troubleshoot-cli-credentials.md	https://docs.zowe.org/stable/user-guide/use-certificates/ (404)	→ cli-using-working-certificates
docs/user-guide/api-mediation/configuration-saf-resource-checking.md	https://docs.zowe.org/stable/user-guide/zss-api/ (404 — page removed in V3)	→ getting-started/zowe-architecture/#zss

⚪ Fixed retired IBM Knowledge Center links

File	Broken URL	Fix
docs/user-guide/cli-swreqplugins.md	IBM KC CICS 5.2 welcome page (404)	→ https://www.ibm.com/docs/en/cics-ts/5.2
docs/user-guide/cli-swreqplugins.md	IBM KC CICS CMCI overview (404)	→ https://www.ibm.com/docs/en/cics-ts/5.2?topic=programming-cics-management-client-interface
docs/user-guide/cli-swreqplugins.md	IBM KC MQ 9.1 (404)	→ https://www.ibm.com/docs/en/ibm-mq/9.1

Not addressed (transient / PR-specific)

• IBM developer blog (503): transient — URL resolves when service is available
• javadoc.io (522): transient — returns 200 now
• ze-configuring-zowe-remote-ssh.md (typo ppendix): file exists only in PR Create Configuring PassTickets for z/OSMF auth #5061, not on master
• troubleshoot-ze.md (wrong relative path): broken reference exists only in PR Create Configuring PassTickets for z/OSMF auth #5061, not on master

Verification

• All 7 fixes are targeted file-only changes with no structural impact
• No changes to sidebars, build config, or generated files
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[github-actions]

🚀 Deployed on https://6a33c3d07ab96c06cc7e0bd8--zowe-docs-master.netlify.app

[janan07]

I updated the links so Zowe Docs links are local. Thanks for the PR.