Fix broken Swagger schema link targets

[wheval]

Summary

Add the missing Swagger component schemas so links resolve in API docs.

Changes

• Added Job and MultisigTransaction schemas to the central Swagger definition.
• Kept the change scoped to docs schema resolution only.

Testing

• npx eslint src/config/swagger.ts
• node -r ts-node/register/transpile-only -e "const { swaggerSpec } = require('./src/config/swagger'); ..."

Closes #821

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[Ceejaytech25]

Nice implementation, LGTM!