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/.claude-plugin/plugin.json

@@ -0,0 +1,33 @@
+{
+  "name": "anime-companion",
+  "version": "0.0.1",
+  "description": "用輕小說角色的個性與語氣取代 Claude 與你對話，並照常協助你做事。以 anime-companion:{作品代號}-{角色代號} 啟動角色",
+  "license": "MIT",
+  "skills": "./skills",
+  "author": {
+    "name": "JSC"
+  },
+  "keywords": ["anime", "light-novel", "persona", "companion"],
+  "userConfig": {
+    "defaultCharacter": {
+      "type": "string",
+      "title": "預設角色",
+      "description": "新 session 自動套用的角色；none 表示不自動套用，需用角色 skill 啟動。",
+      "default": "none",
+      "options": ["none", "sao-asuna", "sao-suguha"]
+    },
+    "intensity": {
+      "type": "string",
+      "title": "強度",
+      "description": "0 不套角色；1 只換稱呼與句尾；2 前後各一個對話氣泡；3 再加動作旁白。",
+      "default": "2",
+      "options": ["0", "1", "2", "3"]
+    },
+    "address": {
+      "type": "string",
+      "title": "稱呼",
+      "description": "角色怎麼稱呼你。留空則依角色與使用者在原作中的關係（亞絲娜叫「桐人」、直葉叫「哥哥」）。",
+      "default": ""
+    }
+  }
+}