feat(controller): create prerequisites from annotation

[rdwj]

Summary

When the annotation mcp.x-k8s.io/auto-create-prerequisites is set to "true" on an MCPServer CR, the operator creates missing ServiceAccounts and ConfigMaps before validation. Resources are owned by the MCPServer and cleaned up on deletion.

Motivation

Deploying MCP servers from the RHOAI catalog requires manually creating ServiceAccounts and ConfigMaps per namespace before the MCPServer CR will reconcile. This annotation-gated feature automates that step for catalog-based deployments.

Addresses #226

Changes

• New file: internal/controller/mcpserver_controller_prerequisites.go — ensurePrerequisites() function
• Modified: internal/controller/mcpserver_controller.go — call ensurePrerequisites() before validation, updated RBAC markers
• Updated: config/rbac/role.yaml — added list, watch, and create verbs for serviceaccounts
• Tests: internal/controller/mcpserver_controller_prerequisites_test.go — 7 test cases covering annotation gating, resource creation, idempotency, and owner references

Testing

Validated on a live RHOAI 3.4 / OpenShift 4.20 cluster:

• With annotation: ServiceAccount and ConfigMap auto-created, MCPServer reconciled to Running
• Without annotation: no resources created, MCPServer correctly reported Failed with missing ConfigMap error
• All existing unit tests pass (make test)
• Lint clean (make lint)

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