feat: add sqlstring and supports-color modules

- Introduced sqlstring module for SQL escape and formatting.
- Added supports-color module to detect terminal color support.
- Created dashboard and login views with Bootstrap styling.
- Implemented user schema in SQL with mock data for testing.

backend/node_modules/mysql2/lib/parsers/string.js

@@ -0,0 +1,50 @@
+'use strict';
+
+const Iconv = require('iconv-lite');
+const { createLRU } = require('lru.min');
+
+const decoderCache = createLRU({
+  max: 500,
+});
+
+exports.decode = function (buffer, encoding, start, end, options) {
+  if (Buffer.isEncoding(encoding)) {
+    return buffer.toString(encoding, start, end);
+  }
+
+  // Optimize for common case: encoding="short_string", options=undefined.
+  let decoder;
+  if (!options) {
+    decoder = decoderCache.get(encoding);
+    if (!decoder) {
+      decoder = Iconv.getDecoder(encoding);
+      decoderCache.set(encoding, decoder);
+    }
+  } else {
+    const decoderArgs = { encoding, options };
+    const decoderKey = JSON.stringify(decoderArgs);
+    decoder = decoderCache.get(decoderKey);
+    if (!decoder) {
+      decoder = Iconv.getDecoder(decoderArgs.encoding, decoderArgs.options);
+      decoderCache.set(decoderKey, decoder);
+    }
+  }
+
+  const res = decoder.write(buffer.slice(start, end));
+  const trail = decoder.end();
+
+  return trail ? res + trail : res;
+};
+
+exports.encode = function (string, encoding, options) {
+  if (Buffer.isEncoding(encoding)) {
+    return Buffer.from(string, encoding);
+  }
+
+  const encoder = Iconv.getEncoder(encoding, options || {});
+
+  const res = encoder.write(string);
+  const trail = encoder.end();
+
+  return trail && trail.length > 0 ? Buffer.concat([res, trail]) : res;
+};