fix: Gitea Traefik routing and connection pool optimization

- Remove middleware reference from Gitea Traefik labels (caused routing issues)
- Optimize Gitea connection pool settings (MAX_IDLE_CONNS=30, authentication_timeout=180s)
- Add explicit service reference in Traefik labels
- Fix intermittent 504 timeouts by improving PostgreSQL connection handling

Fixes Gitea unreachability via git.michaelschiemer.de

resources/js/modules/validation/ValidationRule.js

@@ -0,0 +1,46 @@
+/**
+ * ValidationRule - Individual validation rule
+ * 
+ * Represents a single validation rule with its configuration.
+ */
+
+export class ValidationRule {
+    constructor(name, validator, options = {}) {
+        this.name = name;
+        this.validator = validator;
+        this.options = options;
+    }
+    
+    /**
+     * Validate a value against this rule
+     */
+    async validate(value) {
+        if (typeof this.validator === 'function') {
+            const result = await this.validator(value, this.options);
+            return result === true ? true : (result || this.options.message || 'Validation failed');
+        }
+        return true;
+    }
+    
+    /**
+     * Get rule name
+     */
+    getName() {
+        return this.name;
+    }
+    
+    /**
+     * Get rule options
+     */
+    getOptions() {
+        return { ...this.options };
+    }
+    
+    /**
+     * Create a validation rule
+     */
+    static create(name, validator, options = {}) {
+        return new ValidationRule(name, validator, options);
+    }
+}
+