feat: брендовые цвета имён моделей, персистентность model между сессиями

- _brand_color: цвет имени модели по AI_LAUNCHER
  deepseek=синий(69), claude=оранжевый(173), kimi=голубой(81),
  openrouter=фиолетовый(135), остальные=кремовый(223)
- _restore_model / _restore_model_str: сохранение и восстановление
  model_id в кэше лаунчера (~/.cache/ai-setup/model_<launcher>)
- effort-save-hook также сохраняет model_id при завершении сессии
- ai-claude/ai-openrouter используют восстановленную модель при старте

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

scripts/ai-setup.sh

@@ -1106,6 +1106,44 @@ with open(settings_path, 'w') as f:
 PYEOF
 }
 
+_restore_model() {
+  local default_model="${1:-}"
+  local launcher="${AI_LAUNCHER:-}"
+  [ -z "$launcher" ] && return
+  local model_file="$HOME/.cache/ai-setup/model_${launcher}"
+  local model
+  model=$(cat "$model_file" 2>/dev/null)
+  [ -z "$model" ] && model="$default_model"
+  [ -z "$model" ] && return
+  python3 - "$HOME/.claude/settings.json" "$model" <<'PYEOF'
+import sys, json, os
+settings_path, model = sys.argv[1], sys.argv[2]
+data = {}
+if os.path.exists(settings_path):
+    try:
+        with open(settings_path) as f:
+            data = json.load(f)
+    except Exception:
+        pass
+data['model'] = model
+with open(settings_path, 'w') as f:
+    json.dump(data, f, indent=2, ensure_ascii=False)
+    f.write('\n')
+PYEOF
+}
+
+# _restore_model_str: возвращает сохранённую модель строкой (для ANTHROPIC_MODEL env var)
+_restore_model_str() {
+  local default_model="${1:-}"
+  local launcher="${AI_LAUNCHER:-}"
+  [ -z "$launcher" ] && echo "$default_model" && return
+  local model_file="$HOME/.cache/ai-setup/model_${launcher}"
+  local model
+  model=$(cat "$model_file" 2>/dev/null)
+  [ -z "$model" ] && model="$default_model"
+  echo "$model"
+}
+
 _build_ai_sys_prompt() {
   local global_rules="$HOME/.config/ai-setup/global_rules.md"
   local global_rendered=""
@@ -1377,9 +1415,10 @@ trap 'rm -f "$_PROMPT_FILE"' EXIT INT TERM
 _build_ai_sys_prompt > "$_PROMPT_FILE"
 export AI_LAUNCHER=openrouter
 _restore_effort high
+_MODEL=$(_restore_model_str "openai/gpt-5.5")
 ANTHROPIC_BASE_URL=https://openrouter.ai/api \
 ANTHROPIC_AUTH_TOKEN="$api_key" \
-ANTHROPIC_MODEL=openai/gpt-5.5 \
+ANTHROPIC_MODEL=$_MODEL \
 ANTHROPIC_DEFAULT_OPUS_MODEL=anthropic/claude-4.8-opus \
 ANTHROPIC_DEFAULT_SONNET_MODEL=anthropic/claude-4.6-sonnet \
 ANTHROPIC_DEFAULT_HAIKU_MODEL=openai/gpt-5.5 \
@@ -1431,7 +1470,8 @@ trap 'rm -f "$_PROMPT_FILE"' EXIT INT TERM
 _build_ai_sys_prompt > "$_PROMPT_FILE"
 export AI_LAUNCHER=claude
 _restore_effort xhigh
-claude --dangerously-skip-permissions --model sonnet --system-prompt-file "$_PROMPT_FILE" "$@"
+_restore_model "sonnet"
+claude --dangerously-skip-permissions --system-prompt-file "$_PROMPT_FILE" "$@"
 CLAUDEEOF
 chmod +x "$BIN_DIR/ai-claude"