feat: Add notes search endpoint for enhanced global search

- Add searchNotes service function with company/project info
- Add /notes/search endpoint for searching notes content
- Returns matching notes with linked company/project names

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/controllers/note.controller.js

@@ -167,3 +167,23 @@ export const markReminderSent = async (req, res, next) => {
     next(error);
   }
 };
+
+/**
+ * Search notes with company and project info
+ * GET /api/notes/search?q=searchTerm
+ */
+export const searchNotes = async (req, res, next) => {
+  try {
+    const { q } = req.query;
+
+    const results = await noteService.searchNotes(q);
+
+    res.status(200).json({
+      success: true,
+      count: results.length,
+      data: results,
+    });
+  } catch (error) {
+    next(error);
+  }
+};