feat(hooks): add think-mode hook for automatic model switching

Detects thinking keywords (ultrathink, deepthink, etc.) and switches
to thinking-capable models automatically.

Supports model patterns:
- claude-sonnet-4-0 -> claude-sonnet-4-0-max-thinking
- claude-sonnet-4-20250514 -> claude-sonnet-4-20250514-max-thinking

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/hooks/think-mode/detector.ts

@@ -0,0 +1,57 @@
+const ENGLISH_PATTERNS = [/\bultrathink\b/i, /\bthink\b/i]
+
+const MULTILINGUAL_KEYWORDS = [
+  "생각", "고민", "검토", "제대로",
+  "思考", "考虑", "考慮",
+  "思考", "考え", "熟考",
+  "सोच", "विचार",
+  "تفكير", "تأمل",
+  "চিন্তা", "ভাবনা",
+  "думать", "думай", "размышлять", "размышляй",
+  "pensar", "pense", "refletir", "reflita",
+  "pensar", "piensa", "reflexionar", "reflexiona",
+  "penser", "pense", "réfléchir", "réfléchis",
+  "denken", "denk", "nachdenken",
+  "suy nghĩ", "cân nhắc",
+  "düşün", "düşünmek",
+  "pensare", "pensa", "riflettere", "rifletti",
+  "คิด", "พิจารณา",
+  "myśl", "myśleć", "zastanów",
+  "denken", "denk", "nadenken",
+  "berpikir", "pikir", "pertimbangkan",
+  "думати", "думай", "роздумувати",
+  "σκέψου", "σκέφτομαι",
+  "myslet", "mysli", "přemýšlet",
+  "gândește", "gândi", "reflectă",
+  "tänka", "tänk", "fundera",
+  "gondolkodj", "gondolkodni",
+  "ajattele", "ajatella", "pohdi",
+  "tænk", "tænke", "overvej",
+  "tenk", "tenke", "gruble",
+  "חשוב", "לחשוב", "להרהר",
+  "fikir", "berfikir",
+]
+
+const MULTILINGUAL_PATTERNS = MULTILINGUAL_KEYWORDS.map((kw) => new RegExp(kw, "i"))
+const THINK_PATTERNS = [...ENGLISH_PATTERNS, ...MULTILINGUAL_PATTERNS]
+
+const CODE_BLOCK_PATTERN = /```[\s\S]*?```/g
+const INLINE_CODE_PATTERN = /`[^`]+`/g
+
+function removeCodeBlocks(text: string): string {
+  return text.replace(CODE_BLOCK_PATTERN, "").replace(INLINE_CODE_PATTERN, "")
+}
+
+export function detectThinkKeyword(text: string): boolean {
+  const textWithoutCode = removeCodeBlocks(text)
+  return THINK_PATTERNS.some((pattern) => pattern.test(textWithoutCode))
+}
+
+export function extractPromptText(
+  parts: Array<{ type: string; text?: string }>
+): string {
+  return parts
+    .filter((p) => p.type === "text")
+    .map((p) => p.text || "")
+    .join("")
+}