docs(stage-1): headless API Pattern A auth foundation implementation plan
5-PR TDD plan derived from the Stage 1 spec: token utils + 3-table repos (deerflow layer), APIKeyAuthBackend + AuthMiddleware bearer path, CSRF bearer skip, owner/admin mint endpoints with cross-workspace 404, and /api/v1 dual-mount migration. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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