feat(auth): trusted senders table and API

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.wolf/cerebrum.md

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+---
+description: learned preferences, project conventions, and Do-Not-Repeat rules
+budget_tokens: 2000
+---
+# Cerebrum
+
+> OpenWolf's learning memory. Updated automatically as the AI learns from interactions.
+> Do not edit manually unless correcting an error.
+> Last updated: 2026-10-06
+
+## User Preferences
+
+<!-- How the user likes things done. Code style, tools, patterns, communication. -->
+
+## Key Learnings
+
+- **Project:** LambdaMail
+- **Description:** A self-hosted mail server with an integrated webmail and admin console, built to
+
+## Do-Not-Repeat
+
+<!-- Mistakes made and corrected. Each entry prevents the same mistake recurring. -->
+<!-- Format: [YYYY-MM-DD] Description of what went wrong and what to do instead. -->
+
+## Decision Log
+
+<!-- Significant technical decisions with rationale. Why X was chosen over Y. -->