Fix HAProxy 3.0.11 syntax errors in security templates

- Fix tune.h2.fe-max-total-streams parameter name in global config
- Fix stick-table multiline syntax by removing line continuations
- Replace sc0_get_gpc with sc_get_gpc for proper 3.0.11 syntax
- Replace sc-set-gpc with sc-set-gpt for value assignments
- Update ACL definitions to use correct GPT fetch methods
- Simplify threat scoring to avoid unsupported add-var operations

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

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

templates/hap_header.tpl

@@ -30,7 +30,7 @@ global
     http-fail-codes 500-503     # Server errors for monitoring
 
     # HTTP/2 Security and Performance Tuning
-    tune.h2.fe-max-total-streams 2000        # Connection cycling for security
+    tune.h2.fe.max-total-streams 2000        # Connection cycling for security
     tune.h2.fe.glitches-threshold 50         # Protocol violation detection
     tune.h2.fe.max-concurrent-streams 100    # Balanced security/performance
     tune.bufsize 32768                       # Enhanced HTTP/2 protection