feat: operator auto-detects version for controller/router image defaults

[mangelajo]

Summary

• The operator now resolves :latest image defaults to its own version tag at runtime (e.g. :0.9.0, :0.9.0-rc.1)
• Uses the existing build-time version injected via ldflags (-X main.version=$(GIT_VERSION))
• Admin overrides with explicit image tags pass through unchanged
• Dev builds (version="dev") preserve :latest as-is
• Eliminates the need to manually update kubebuilder defaults in jumpstarter_types.go during releases

Test plan

• Verify operator logs its version at startup
• Deploy with a tagged operator image → controller/router deployments should use matching version tag
• Deploy with :latest operator (dev build) → controller/router should also use :latest
• Set explicit image override in CR → operator should respect the override, not replace it

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 2a9b9c17-367c-400c-bd47-c188f568ad4c

📥 Commits

Reviewing files that changed from the base of the PR and between 26aee22 and 52d35e7.

📒 Files selected for processing (2)

• controller/deploy/operator/cmd/main.go
• controller/deploy/operator/internal/controller/jumpstarter/jumpstarter_controller.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch worktree-operator-version-detect

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