chore(knip): add config and remove dead code/deps

- knip.json: scope to src, ignore submodule/worktrees, mark
  generated abi.ts as unresolved-allowed, honor @public JSDoc tag
- drop 14 orphaned files (12 ui components, model/Bank, model/Pix)
- drop 18 unused deps (urql, tanstack, wagmi/{core,vue}, graphql,
  permissionless, graphql-codegen suite, axe-core, lighthouse,
  vue/test-utils)
- drop 4 unused exports and de-export 9 internal-only types
- mark NetworksTestnet as @public (in-flight testnet support)

src/utils/pixKeyFormat.ts

@@ -1,15 +1,3 @@
-export const pixFormatValidation = (pixKey: string): boolean => {
-  const cpf = /(^\d{3}\.?\d{3}\.?\d{3}-?\d{2}$)/g;
-  const cnpj = /(^\d{2}\.?\d{3}\.?\d{3}\/?\d{4}-?\d{2}$)/g;
-  const telefone = /(^[0-9]{2})?(\s|-)?(9?[0-9]{4})-?([0-9]{4}$)/g;
-
-  if (pixKey.match(cpf) || pixKey.match(cnpj) || pixKey.match(telefone)) {
-    return true;
-  }
-
-  return false;
-};
-
 export const postProcessKey = (pixKey: string): string => {
   pixKey = pixKey.replace(/[-.()/]/g, '');
   return pixKey;