SQLite Testing

=====##http_security_headers(): void##=====
Sets security-related HTTP headers.
*| Header | Purpose | Config Key |*
|| Content-Security-Policy | XSS/injection protection | ##csp## ||
|| Permissions-Policy | Control browser features |
##permissions_policy## ||
|| Referrer-Policy | Control referrer information |
##referrer_policy## ||
|| Strict-Transport-Security | Force HTTPS | Auto (TLS only) ||
|| X-Frame-Options | Clickjacking protection | Hardcoded:
##SAMEORIGIN## ||
|| X-Content-Type-Options | MIME sniffing prevention | Hardcoded:
##nosniff## ||
**CSP Configuration Options:**
  - ##0## - Disabled
  - ##1## - Default policy (from ##csp.conf##)
  - ##2## - Custom policy (from ##csp_custom.conf##)
===Configuration Dependencies===
The class relies on these database configuration settings:
*| Setting | Type | Purpose |*
|| ##base_url## | string | Wiki's base URL ||
|| ##tls## | bool | Enable HTTPS enforcement ||
|| ##cache## | bool | Enable page caching ||
|| ##cache_ttl## | int | Cache lifetime in seconds ||
|| ##session_store## | int | 1=File, 0=Database ||
|| ##system_seed_hash## | string | Session encryption seed ||
|| ##cookie_prefix## | string | Session cookie prefix ||
|| ##cookie_path## | string | Cookie path ||
|| ##allow_persistent_cookie## | bool | Allow persistent login ||
|| ##session_length## | int | Session lifetime in seconds ||
|| ##reverse_proxy_addresses## | string | Comma/space-separated proxy
IPs ||
|| ##reverse_proxy_header## | string | Custom X-Forwarded header ||
|| ##language## | string | Default language code ||
|| ##multilanguage## | bool | Enable language negotiation ||
|| ##allowed_languages## | string | Comma/space-separated allowed
langs ||
|| ##enable_security_headers## | bool | Send security headers ||
|| ##csp## | int | CSP setting (0/1/2) ||
|| ##permissions_policy## | int | Permissions-Policy setting (0/1/2)
||
|| ##referrer_policy## | int | Referrer-Policy setting (0-8) ||