fix: Fix HTTPClient, Dashboard, and Log Parser errors

BUG FIXES:

1. HTTPClient '_generate_cache_key' AttributeError:
   - The method definition was missing, only had docstring and body
   - Added proper method signature: def _generate_cache_key(self, url, params)

2. Dashboard 'bg_dark' KeyError:
   - EU_COLORS doesn't have 'bg_dark'
   - Changed to 'bg_secondary' which is the correct color

3. Log Parser 'maximum recursion depth exceeded':
   - read_log() was calling itself instead of parent method
   - Changed to super().read_log() to call BasePlugin's method

These fixes resolve:
- Universal Search not working
- API errors
- Dashboard customize dialog crash
- Log Parser infinite recursion

core/http_client.py

@@ -186,6 +186,8 @@ class HTTPClient:
                 pass
         
         return url
+    
+    def _generate_cache_key(self, url: str, params: Optional[Dict] = None) -> str:
         """Generate a cache key from URL and parameters."""
         key_string = url
         if params:

plugins/dashboard/plugin.py

@@ -266,7 +266,7 @@ class DashboardPlugin(BasePlugin):
         dialog.setWindowTitle("Customize Dashboard")
         dialog.setStyleSheet(f"""
             QDialog {{
-                background-color: {EU_COLORS['bg_dark']};
+                background-color: {EU_COLORS['bg_secondary']};
                 color: white;
             }}
             QLabel {{

plugins/log_parser_test/plugin.py

@@ -360,7 +360,8 @@ class LogParserTestPlugin(BasePlugin):
     def read_log(self, lines=50):
         """Read recent log lines."""
         try:
-            log_lines = self.read_log(lines=lines)
+            # Call parent class method (BasePlugin.read_log)
+            log_lines = super().read_log(lines=lines)
             if log_lines:
                 self.raw_log_text.setPlainText('\n'.join(log_lines))
         except Exception as e: