Migrate configuration paths to /etc/easyhaproxy and improve health check support in E2E tests

- Refactored HAProxy configuration files, templates, and paths to use `/etc/easyhaproxy` instead of `/etc/haproxy`.
- Updated Dockerfile to generate DH params and placeholder certificates in the new configuration directory.
- Added health check support with timeout to `DockerComposeFixture` in E2E test utilities.
- Adjusted tests, templates, and plugins to use the new `Consts`-based configuration paths.
- Introduced pytest fixtures for environment isolation and temporary directory management.

src/plugins/builtin/fastcgi.py

@@ -10,7 +10,7 @@ The plugin creates:
 
 Configuration:
     - enabled: Enable/disable the plugin (default: true)
-    - document_root: Document root path (default: /var/www/html)
+    - document_root: Document root path (default: /etc/easyhaproxy/www)
     - script_filename: Pattern for SCRIPT_FILENAME (default: %[path])
     - index_file: Default index file (default: index.php)
     - path_info: Enable PATH_INFO support (default: true)
@@ -39,6 +39,8 @@ Example Kubernetes Annotation:
 import os
 import sys
 
+from functions import Consts
+
 # Add parent directory to path for imports
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
@@ -50,7 +52,7 @@ class FastcgiPlugin(PluginInterface):
 
     def __init__(self):
         self.enabled = True
-        self.document_root = "/var/www/html"
+        self.document_root = Consts.base_path + "/www"
         self.script_filename = "%[path]"
         self.index_file = "index.php"
         self.path_info = True