feat: add missing audit scripts and lint configuration

Implemented the missing scripts required by the audit-agent:
- `scripts/check-file-size.mjs`: Checks for files exceeding 300 lines.
- `scripts/check-innerhtml.mjs`: Checks for `innerHTML` usage.
- Added `npm run lint` script using ESLint with a basic configuration.
- Added `eslint` and related dependencies.

This unblocks the audit-agent daily schedule.

Co-authored-by: PR0M3TH3AN <[email protected]>

scripts/check-innerhtml.mjs

@@ -0,0 +1,70 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+const EXCLUDED_DIRS = ['node_modules', '.git', 'dist', 'artifacts', 'test_logs', 'coverage'];
+const TARGET_EXTENSIONS = ['.js', '.mjs', '.ts', '.html'];
+
+function countInnerHTML(filePath) {
+  try {
+    const content = fs.readFileSync(filePath, 'utf8');
+    // Basic regex to find assignment to innerHTML
+    const regex = /\.innerHTML\s*=/g;
+    const matches = content.match(regex);
+    return matches ? matches.length : 0;
+  } catch (error) {
+    console.error(`Error reading ${filePath}: ${error.message}`);
+    return 0;
+  }
+}
+
+function scanDirectory(dir) {
+  let files = [];
+  try {
+    const items = fs.readdirSync(dir);
+    for (const item of items) {
+      const fullPath = path.join(dir, item);
+      const stat = fs.statSync(fullPath);
+
+      if (stat.isDirectory()) {
+        if (!EXCLUDED_DIRS.includes(item)) {
+           files = files.concat(scanDirectory(fullPath));
+        }
+      } else if (stat.isFile()) {
+        if (TARGET_EXTENSIONS.includes(path.extname(item))) {
+           files.push(fullPath);
+        }
+      }
+    }
+  } catch (error) {
+    console.error(`Error scanning ${dir}: ${error.message}`);
+  }
+  return files;
+}
+
+function main() {
+  const args = process.argv.slice(2);
+  const reportMode = args.includes('--report');
+
+  const files = scanDirectory('.');
+  let totalAssignments = 0;
+  let offenderCount = 0;
+
+  for (const file of files) {
+    const count = countInnerHTML(file);
+    if (count > 0) {
+      console.log(`${file}: ${count} assignments`);
+      totalAssignments += count;
+      offenderCount++;
+    }
+  }
+
+  if (reportMode && totalAssignments > 0) {
+    console.log(`Total assignments: ${totalAssignments}`);
+  }
+
+  if (!reportMode && offenderCount > 0) {
+    process.exit(1);
+  }
+}
+
+main();