fix(mfr): add LaTeX symbol replacements for fint and up

- Add regex patterns for replacing LaTeX symbols \fint and \up with their Unicode equivalents

magic_pdf/model/sub_modules/mfr/unimernet/unimernet_hf/modeling_unimernet.py

@@ -343,7 +343,9 @@ REPLACEMENTS_PATTERNS = {
     re.compile(r'\\slash'): r'/',
     re.compile(r'\\textperthousand'): r'‰',
     re.compile(r'\\sun'): r'☉',
-    re.compile(r'\\textunderscore'): r'\\_'
+    re.compile(r'\\textunderscore'): r'\\_',
+    re.compile(r'\\fint'): r'⨏',
+    re.compile(r'\\up '): r'\\ ',
 }
 QQUAD_PATTERN = re.compile(r'\\qquad(?!\s)')