feat: anime-companion 插件骨架與設定 (#3)

兩個角色 skill 空殼（sao-asuna、sao-suguha）、userConfig（預設角色、強度、稱呼）、
設定解析與測試，並登錄到 marketplace。

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

plugins/anime-companion/hooks/config.ts

@@ -0,0 +1,31 @@
+import { CHARACTERS, isCharacterCode, type CharacterCode } from './characters'
+
+export type Intensity = 0 | 1 | 2 | 3
+
+export type Config = {
+  character: CharacterCode | null
+  intensity: Intensity
+  address: string | null
+}
+
+export const DEFAULT_INTENSITY: Intensity = 2
+
+function toIntensity(value: unknown): Intensity {
+  const n = typeof value === 'number' ? value : Number(value)
+  return n === 0 || n === 1 || n === 2 || n === 3 ? n : DEFAULT_INTENSITY
+}
+
+// 缺失或無效的值一律退回預設，不讓設定錯誤擋住載入。
+export function resolveConfig(options: Readonly<Record<string, unknown>>): Config {
+  const address = typeof options.address === 'string' ? options.address.trim() : ''
+  return {
+    character: isCharacterCode(options.defaultCharacter) ? options.defaultCharacter : null,
+    intensity: toIntensity(options.intensity),
+    address: address === '' ? null : address,
+  }
+}
+
+// 使用者的覆寫優先，否則用角色在原作中對使用者的稱呼。
+export function addressFor(config: Config, character: CharacterCode): string {
+  return config.address ?? CHARACTERS[character].address
+}