Configure UTF-8 output encoding globally

Force UTF-8 encoding for stdout/stderr streams to handle locale-related
issues across platforms. This replaces the manual encoding workaround and
ensures consistent behavior regardless of the system's locale settings.

- Fixes crashes when printing Unicode characters on systems with non-UTF-8
  locales (e.g. Chinese GB18030 or Windows CP1252)
- Centralizes encoding configuration in init.py
- Removes redundant per-file encoding logic

This approach works cross-platform by directly wrapping the standard
streams rather than relying on environment variables, which can be
unreliable on Windows.

codechecker_common/cli.py

@@ -13,11 +13,27 @@
 
 import argparse
 from importlib import machinery
+import io
 import json
 import os
 import signal
 import sys
 
+def configure_utf8_output():
+    """Force UTF-8 encoding for stdout/stderr across all platforms."""
+    # Reconfigure standard streams
+    sys.stdout = io.TextIOWrapper(
+        sys.stdout.buffer,
+        encoding='utf-8',
+        errors='backslashreplace',
+        line_buffering=sys.stdout.line_buffering
+    )
+    sys.stderr = io.TextIOWrapper(
+        sys.stderr.buffer,
+        encoding='utf-8',
+        errors='backslashreplace',
+        line_buffering=sys.stderr.line_buffering
+    )
 
 class ArgumentParser(argparse.ArgumentParser):
     def error(self, message):
@@ -93,6 +109,8 @@ def main():
     """
     CodeChecker main command line.
     """
+    configure_utf8_output()
+
     if not os.environ.get('CC_LIB_DIR'):
         os.environ['CC_LIB_DIR'] = \
                 os.path.dirname(os.path.dirname(os.path.realpath(__file__)))

tools/report-converter/codechecker_report_converter/report/output/plaintext.py

@@ -7,7 +7,6 @@
 # -------------------------------------------------------------------------
 """ Helper and converter functions for plain text format. """
 
-import locale
 import logging
 import math
 import os
@@ -177,9 +176,8 @@ def convert(
                 if source_comment and source_comment.line:
                     output.write(f"{source_comment.line.rstrip()}\n")
 
-                output.write(
-                    f"{format_main_report(report)}"
-                    .encode('utf-8').decode(locale.getlocale()[1] or "utf-8"))
+                output.write(format_main_report(report))
+
             else:
                 output.write(InvalidFileContentMsg)