Refactor configuration and security features for improved development experience

- Updated the .env.example file to reflect a development environment setup with enhanced secret key requirements and local host settings.
- Modified the Docker Compose configuration to enhance security with read-only settings and no-new-privileges options.
- Updated requirements.txt to pin package versions for better dependency management.
- Enhanced the FastAPI application to include dynamic OpenAPI and documentation URLs based on the environment.
- Implemented session versioning in JWT tokens to improve security and user session management.
- Added new validation for user roles and password strength in schemas.
- Improved email sending logic to handle recipient lists more robustly and added logging for SMTP operations.
- Updated dashboard and profile templates to reflect new features and improve user experience.

app/core/password_policy.py

@@ -0,0 +1,18 @@
+import re
+
+_PASSWORD_RULES: tuple[tuple[re.Pattern[str], str], ...] = (
+    (re.compile(r".{10,}"), "Mindestens 10 Zeichen."),
+    (re.compile(r"[A-Z]"), "Mindestens ein Großbuchstabe."),
+    (re.compile(r"[a-z]"), "Mindestens ein Kleinbuchstabe."),
+    (re.compile(r"\d"), "Mindestens eine Ziffer."),
+)
+
+
+def password_policy_errors(password: str) -> list[str]:
+    return [msg for pattern, msg in _PASSWORD_RULES if not pattern.search(password)]
+
+
+def validate_password_strength(password: str) -> None:
+    errors = password_policy_errors(password)
+    if errors:
+        raise ValueError(errors[0])