chore(deps): upgrade backend to Fastify 5 on v2.25.0-fixes

[PR3MM]

https://issues.redhat.com/browse/RHOAIENG-81841

Description

Ports the Fastify 5 backend migration from main (#9202) onto the v2.25.0-fixes release branch. Bumps fastify and all version-coupled @fastify/* plugins in the same change set.

Dependency changes (backend/package.json):

Package	Before	After
fastify	4.16.0	5.11.x
fastify-plugin	4.5.1	5.1.0
@fastify/autoload	5.7.1	6.5.0
@fastify/http-proxy	9.5.0	11.6.0
@fastify/reply-from	(transitive 9.x)	12.6.4 (transitive)
@fastify/static	6.10.2	10.1.3
@fastify/websocket	8.2.0	11.3.0
@fastify/sensible	5.2.0	6.0.4
@fastify/accepts	4.3.0	5.0.4
undici	5.x (transitive)	7.29.0 (transitive)
typescript	^5.3.3	~5.4.5
Backend code changes for Fastify 5 API compatibility:

• server.ts: logger → loggerInstance
• routes/wss/k8s/index.ts: WebSocket handler uses connection directly; typed ping/pong/error callbacks
• routes/api/storage/index.ts + utils/resourceUtils.ts: log.error uses pino object form
• tsconfig.json: skipLibCheck: true (Fastify 5 typings on TS 5.4)
• backend/package-lock.json: regenerated for Fastify 5 dependency tree

How Has This Been Tested?

Automated

• npm run test (backend) — lint, type-check, jest 17/17 pass
• npm run build (backend) — pass
• npm ci --dry-run (backend) — pass
  Resolved lock versions:
• fastify@5.11.3
• @fastify/websocket@11.3.0
• @fastify/http-proxy@11.6.0
• @fastify/autoload@6.5.0
• @fastify/reply-from@12.6.4
• undici@7.29.0
• typescript@5.4.5

Manual

Logged in as htpasswd-cluster-admin-user via make login + npm run dev.

Area	Test	Result
Boot	/api/health, /api/status, /api/config	200
DSC / DSCI	/api/dsc/status, /api/dsci/status	200 (real component data)
K8s REST	/api/k8s/... proxy	200
UI	Dashboard loads	Pass
WebSocket	/wss/k8s/... watch in browser	(confirm 101 before merge)

Test Impact

• No new unit tests — this branch has no websocket proxy spec
• Functional coverage via manual testing above per RHOAIENG-81841
• No Cypress changes — backend-only dependency migration

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)
• The code follows our Best Practices (React coding standards, PatternFly usage, performance considerations)
  If you have UI changes:
• Included any necessary screenshots or gifs if it was a UI change.
• Included tags to the UX team if it was a UI/UX change.
  After the PR is posted & before it merges:
• The developer has tested their solution on a cluster by using the image produced by the PR to v2.25.0-fixes

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[manaswinidas]

create this PR to stable-2.x

[PR3MM]

Created PR to stable-2.x