fix: support HTTP middleware metadata instances

[lisiqi1983]

Summary

• allow HTTP route metadata guards, pipes, and exception filters to be class providers or pre-built instances
• resolve instance metadata directly before falling back to ModuleRef for class providers
• add regression coverage for guard, pipe, and exception filter instances

Fixes #128

Verification

• npm test -- --runInBand src/http/routing/route-registry-middleware.spec.ts
• npx tsc -p tsconfig.build.json --noEmit
• npx eslint src/http/routing/route-registry.ts src/http/routing/route-registry-middleware.spec.ts
• npx prettier --check src/http/routing/route-registry.ts src/http/routing/route-registry-middleware.spec.ts
• git diff --check -- src/http/routing/route-registry.ts src/http/routing/route-registry-middleware.spec.ts

Summary by CodeRabbit

• New Features
  • Route middleware configuration now accepts both class constructors and pre-instantiated objects for guards, pipes, and exception filters, enabling greater flexibility in middleware setup.

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[VikramAditya33]

@lisiqi1983 Are you done with this PR so that I can review or is anything left?

[lisiqi1983]

Thanks, this is ready for review now. I marked it ready and the verification steps are listed in the PR body.

[VikramAditya33]

Thanks for the PR, the instance resolution logic and tests look alright. I've left an inline comment for a fix please take a look and also comment under the issue so that I can assign this issue to you.

[VikramAditya33]

LGTM, Thank you. Could you please squash your commits into one?

[lisiqi1983]

Thanks, done — I squashed the PR down to a single commit while keeping the same tested changes.

[VikramAditya33]

Thank you LGTM