fix: force UTF-8 console so Oracle server starts on Windows cp1252

run_oracle printed a '→' in its startup banner, which crashed with
UnicodeEncodeError on Windows consoles/pipes using the cp1252 code page
(observed on Python 3.14), so the server never finished booting. Added
_force_utf8_console(), called first in run_oracle, to reconfigure
stdout/stderr to UTF-8 (errors="replace") — covering both startup banners
and the logging StreamHandler. Verified the server now boots without the
PYTHONIOENCODING=utf-8 workaround.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: drknowhow

oracle/oracle_server.py

@@ -825,8 +825,19 @@ def _is_oracle_running(port: int) -> bool:
         return False
 
 
+def _force_utf8_console() -> None:
+    """Make stdout/stderr UTF-8 so banner/log output can't crash on legacy
+    Windows code pages (cp1252 raises UnicodeEncodeError on chars like '→')."""
+    for stream in (sys.stdout, sys.stderr):
+        try:
+            stream.reconfigure(encoding="utf-8", errors="replace")
+        except (AttributeError, ValueError, OSError):
+            pass
+
+
 def run_oracle(port: int = None, open_browser: bool = None):
     """Main entry point for Oracle server."""
+    _force_utf8_console()
     _init_services()
 
     cfg = load_config()