feat: add ParameterCandidate type for script parameter detection

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/types/scripts.ts

@@ -122,3 +122,16 @@ export interface ScriptTemplateUpdateRequest {
   requires_elevation?: boolean
   requires_modules?: string[]
 }
+
+export interface ParameterCandidate {
+  variableName: string
+  suggestedKey: string
+  suggestedLabel: string
+  suggestedType: ScriptParameter['type']
+  sensitive: boolean
+  defaultValue: string | boolean | number | null
+  source: 'param_block' | 'assignment'
+  lineNumber: number
+  matchedLine: string
+  inferenceReason: string
+}