Fix npm deprecation warnings and SSR IndexedDB issue for Cloudflare deployment

Co-authored-by: Bruno-366 <81762173+Bruno-366@users.noreply.github.com>

Author: Copilot

.eslintrc.cjs

@@ -0,0 +1,6 @@
+# Cloudflare Pages configuration for security headers
+/*
+  X-Frame-Options: DENY
+  X-Content-Type-Options: nosniff
+  X-XSS-Protection: 1; mode=block
+  Referrer-Policy: strict-origin-when-cross-origin

_headers

@@ -0,0 +1,34 @@
+import eslint from '@eslint/js'
+import tseslint from 'typescript-eslint'
+import sveltePlugin from 'eslint-plugin-svelte'
+import globals from 'globals'
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  ...sveltePlugin.configs['flat/recommended'],
+  {
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.node
+      }
+    }
+  },
+  {
+    files: ['**/*.svelte'],
+    languageOptions: {
+      parserOptions: {
+        parser: tseslint.parser
+      }
+    }
+  },
+  {
+    rules: {
+      '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }]
+    }
+  },
+  {
+    ignores: ['dist/**', '.svelte-kit/**', 'build/**']
+  }
+)