docs: format thesis student id

docs/thesis/system-design-implementation.md

@@ -2,6 +2,7 @@
 title: "Design and Implementation of lda.chat: An AI Agent for Automating and Creating Workspace Workflows"
 subtitle: ""
 author: "Lương Đức Anh"
+student-id: "23BI14021"
 date: "July 1, 2026"
 lang: "en-US"
 documentclass: report

docs/thesis/title-pages.tex

@@ -31,6 +31,8 @@
     {\large By\par}
     \vspace{0.2cm}
     {\large\bfseries Lương Đức Anh\par}
+    \vspace{0.1cm}
+    {\normalsize Student ID: 23BI14021\par}
     \vspace{0.9cm}
     {\large Title:\par}
     \vspace{0.2cm}