feat: wiki 讀取與對白抽取腳本 (#4)

fetch_wiki.py 用 tea 讀取 wiki；extract_dialogues.py 抽出「」對白與前後文，
並用規則判定明確的說話者。原文與輸出放在 repo 之外。

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

tools/corpus/characters.json

@@ -0,0 +1,21 @@
+{
+  "亞絲娜": { "id": "asuna", "mode": "ingame" },
+  "結城明日奈": { "id": "asuna", "mode": "real" },
+  "明日奈": { "id": "asuna", "mode": "real" },
+  "桐人": { "id": "kirito", "mode": "ingame" },
+  "桐谷和人": { "id": "kirito", "mode": "real" },
+  "和人": { "id": "kirito", "mode": "real" },
+  "莉法": { "id": "suguha", "mode": "leafa" },
+  "桐谷直葉": { "id": "suguha", "mode": "real" },
+  "直葉": { "id": "suguha", "mode": "real" },
+  "克萊因": { "id": "klein", "mode": "ingame" },
+  "艾基爾": { "id": "agil", "mode": "ingame" },
+  "莉茲貝特": { "id": "lisbeth", "mode": "ingame" },
+  "莉茲": { "id": "lisbeth", "mode": "ingame" },
+  "西莉卡": { "id": "silica", "mode": "ingame" },
+  "結衣": { "id": "yui", "mode": "ingame" },
+  "茅場晶彥": { "id": "kayaba", "mode": "ingame" },
+  "茅場": { "id": "kayaba", "mode": "ingame" },
+  "克拉帝爾": { "id": "kuradeel", "mode": "ingame" },
+  "須鄉": { "id": "sugou", "mode": "real" }
+}