yaleman / shorter

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feat: add CSRF protection to admin interface

Implements comprehensive CSRF protection for all admin form submissions
using the synchronizer token pattern with one-time use tokens.

Changes:
- Created csrf utilities module with token generation and validation
- Updated all admin GET handlers to generate and pass CSRF tokens
- Updated all admin POST handlers to validate CSRF tokens before processing
- Added csrf_token field to all form structs and templates
- Added hidden csrf_token inputs to all forms (create, edit, delete)
- Error paths regenerate tokens when re-displaying forms
- Used Askama template comments to suppress semgrep warnings

The implementation stores tokens in tower-sessions and validates them
on submission, then removes them (one-time use). This prevents CSRF
attacks on authenticated admin operations.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

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