chore: add 4 issue templates + customer-priority-bump reusable workflow

[LukasWodka]

Summary

Adds the org-wide issue intake structure and one supporting reusable workflow.

Issue templates (.github/ISSUE_TEMPLATE/)

4 structured forms — Feature, Bug, Tech-debt, Docs — plus a config.yml that disables blank issues. Apply org-wide to any repo without its own templates. Each template enforces required fields (problem, AC, repro steps, severity, etc.) so even raw "capture" produces something refinable.

Customer-priority-bump reusable workflow (.github/workflows/customer-priority-bump.yml)

Called by each active repo on issue label changes. When from:customer is applied, sets Priority = P1 on the kanban automatically. Uses the existing PROJECTS_KANBAN_TOKEN org secret. Same shape as advance-deploy-env.yml.

Activation

• Issue templates: active immediately on merge for any repo without its own .github/ISSUE_TEMPLATE/
• Customer-priority-bump: dormant until each repo opts in via a tiny caller workflow (rolling out separately)

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