fix: add openapi API routes

[synackd]

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Description

Re-add missing OpenAPI endpoints:

• /openapi.json: OpenAPI spec in JSON format
• /docs: OpenAPI UI

Fabrica does not regenerate main.go, so these must be added manually.

To test:

1. make build
2. go run ./cmd/server/ serve
3. curl localhost:8080/openapi.json
4. curl localhost:8080/docs

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

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[synackd]

Related to OpenCHAMI/roadmap#124