feat(thinking): add adaptive thinking support for Claude models

Add support for Claude's "adaptive" and "auto" thinking modes using `output_config.effort`. Introduce support for new effort level "max" in adaptive thinking. Update thinking logic, validate model capabilities, and extend converters and handling to ensure compatibility with adaptive modes. Adjust static model data with supported levels and refine handling across translators and executors.

internal/thinking/suffix.go

@@ -109,7 +109,7 @@ func ParseSpecialSuffix(rawSuffix string) (mode ThinkingMode, ok bool) {
 // ParseLevelSuffix attempts to parse a raw suffix as a discrete thinking level.
 //
 // This function parses the raw suffix content (from ParseSuffix.RawSuffix) as a level.
-// Only discrete effort levels are valid: minimal, low, medium, high, xhigh.
+// Only discrete effort levels are valid: minimal, low, medium, high, xhigh, max.
 // Level matching is case-insensitive.
 //
 // Special values (none, auto) are NOT handled by this function; use ParseSpecialSuffix
@@ -140,6 +140,8 @@ func ParseLevelSuffix(rawSuffix string) (level ThinkingLevel, ok bool) {
 		return LevelHigh, true
 	case "xhigh":
 		return LevelXHigh, true
+	case "max":
+		return LevelMax, true
 	default:
 		return "", false
 	}