Kyle Pope 0e0da4bd14 Fix nginx header inheritance regression and add 0.0.0.0/8 to SSRF blocklist
NEW-1: add_header in location /api block suppressed server-level security
headers (HSTS, CSP, X-Frame-Options, etc). Duplicate all security headers
into the /api block explicitly per nginx inheritance rules.

NEW-2: Add 0.0.0.0/8 to _BLOCKED_NETWORKS — on Linux 0.0.0.0 connects
to localhost, bypassing the existing loopback check.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-03 18:41:16 +08:00
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