chore: initialize from backend template 0a6dd0e

docs/runbooks/startup-profile-mismatch.md

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+---
+title: Runbook — PROFILE_MISMATCH (프로파일 불일치)
+category: INTERNAL
+error_codes: [PROFILE_MISMATCH]
+severity: P1
+owner: oncall
+last_updated: 2026-06-15
+status: stub
+---
+
+# Runbook: PROFILE_MISMATCH (`runbook://startup/profile-mismatch`)
+
+## Symptoms
+
+- Container exits with code 71 (profile mismatch exit)
+- Structured log with `error.code=PROFILE_MISMATCH`, `startup.phase=profile-check`
+- Production profile active with local-only settings enabled
+
+## Diagnosis
+
+- Check active Spring profiles (`spring.profiles.active`)
+- Identify which local-only setting is incorrectly enabled in prod profile
+
+## Action
+
+- Remove local-only setting from production deployment config
+- Ensure prod profile does not inherit local/dev profile settings
+
+## Escalation
+
+- P1: security risk if local settings expose debug endpoints in production
+
+---
+
+> **Stub**: Phase D2 — author body after domain adoption. (feature-operational-runbook-contract D9)