Refactor provider composition and ESLint configuration

- Add new provider composition system with validation
- Create providerComposition.tsx for centralized provider management
- Implement providerOrderValidator.tsx to ensure correct provider order
- Add comprehensive tests for provider composition
- Create custom ESLint rules in frontend/eslint-rules/
- Update ESLint configuration
- Update architecture and tasks documentation

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

frontend/eslint-rules/index.js

@@ -0,0 +1,14 @@
+/**
+ * BanGUI Custom ESLint Rules
+ *
+ * This module exports all custom ESLint rules used to enforce
+ * coding standards and best practices in the BanGUI frontend.
+ */
+
+import providerOrderRule from "./provider-order.js";
+
+export default {
+  rules: {
+    "provider-order": providerOrderRule,
+  },
+};