chore: ruff auto-fixes — collapsible-else-if, if-stmt-min-max, dict.fromkeys (#23926)

PLR5501 (collapsible-else-if): 28 instances — else: if: → elif:
PLR1730 (if-stmt-min-max):   15 instances — if x<y: x=y → x=max(x,y)
C420   (dict.fromkeys):       2 instances — dictcomp → dict.fromkeys
PLR1704 (redefined-argument): 1 instance — reason → err_msg (shadow fix)
C414   (unnecessary-list):    1 instance — sorted(list(x)) → sorted(x)

28 files, -44 net lines. All mechanical, zero logic changes.
17,211 tests pass, zero regressions.

tools/tts_tool.py

@@ -466,13 +466,12 @@ def _shell_quote_context(command_template: str, position: int) -> Optional[str]:
                 escaped = True
             elif char == '"':
                 quote = None
-        else:
-            if char == "'":
-                quote = "'"
-            elif char == '"':
-                quote = '"'
-            elif char == "\\":
-                i += 1
+        elif char == "'":
+            quote = "'"
+        elif char == '"':
+            quote = '"'
+        elif char == "\\":
+            i += 1
         i += 1
     return quote