refactor(server): extract URL detection and color utils from index.js (#657)

No behavioral changes — 1:1 code move with imports replacing inline definitions.

server/utils/colors.js

@@ -0,0 +1,21 @@
+// ANSI color codes for terminal output
+const colors = {
+    reset: '\x1b[0m',
+    bright: '\x1b[1m',
+    cyan: '\x1b[36m',
+    green: '\x1b[32m',
+    yellow: '\x1b[33m',
+    blue: '\x1b[34m',
+    dim: '\x1b[2m',
+};
+
+const c = {
+    info: (text) => `${colors.cyan}${text}${colors.reset}`,
+    ok: (text) => `${colors.green}${text}${colors.reset}`,
+    warn: (text) => `${colors.yellow}${text}${colors.reset}`,
+    tip: (text) => `${colors.blue}${text}${colors.reset}`,
+    bright: (text) => `${colors.bright}${text}${colors.reset}`,
+    dim: (text) => `${colors.dim}${text}${colors.reset}`,
+};
+
+export { colors, c };