feat: add UMass Amherst theme support, implement HTML snippet management system, and update page rendering logic

sisvietnamvn_main/extract_content_top_manual.py

@@ -0,0 +1,36 @@
+import sys
+
+file_path = "/home/x79/sisvietnamvn_01/sisvietnamvn_Trang chính thức hiện tại/UMass Amherst _ UMass Amherst.html"
+
+with open(file_path, "r", encoding="utf-8") as f:
+    lines = f.readlines()
+
+start_idx = -1
+for i, line in enumerate(lines):
+    if '<div class="content-top">' in line:
+        start_idx = i
+        break
+
+if start_idx == -1:
+    print("Could not find <div class=\"content-top\">")
+    sys.exit(1)
+
+extracted = []
+div_count = 0
+found_start = False
+
+for line in lines[start_idx:]:
+    # Simple tag counting to find the matching closing div
+    # Note: this is a naive counter, it doesn't account for HTML comments or script tags containing strings that look like tags,
+    # but it usually works well for standard HTML layout sections.
+    div_count += line.count("<div")
+    div_count -= line.count("</div")
+    
+    extracted.append(line)
+    if div_count == 0:
+        break
+
+output_path = "src/main/resources/templates/themes/umass/content-top.html"
+with open(output_path, "w", encoding="utf-8") as f:
+    f.writelines(extracted)
+print(f"Extracted to {output_path}")