feat(qwen): add ai-qwen launcher for Alibaba Token Plan (Qwen3.8)

ai-qwen runs Claude Code through Alibaba Cloud Model Studio's
Anthropic-compatible Token Plan endpoint
(token-plan.ap-southeast-1.maas.aliyuncs.com/apps/anthropic). The shared
key is built into the generated script, so it starts right away without
asking for a key.

qwen3.8-max (the smartest model the key has) is in opus/sonnet and for
subagents, --model opus on each start; qwen3.8-flash is in haiku for
background tasks. Measured on 20.10: both models accept up to 983616
input tokens (CLAUDE_CODE_MAX_CONTEXT_TOKENS=1000000, autocompact fires
before the API limit) and see images. Qwen validates
output_config.effort (bogus -> 400), Max shows no trend from low to
max, Flash thinks ~2x longer on max; the launcher starts on --effort max
like ai-mimo, EFFORT_MAPPING.md records the measurements.

setup.sh status, statusline brand color, README, QUICK_START and
AGENTS.md list the new launcher.

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

QUICK_START.md

@@ -7,7 +7,7 @@ bash setup.sh
 ```
 
 Установит лаунчеры
-`ai-claude`, `ai-gpt`, `ai-deepseek`, `ai-kimi`, `ai-glm`, `ai-eltex`, `ai-eltex-qwen`, `ai-mimo`, `ai-openrouter`, `ai-opencode`, `ai-gemini`, `ai-cursor`
+`ai-claude`, `ai-gpt`, `ai-deepseek`, `ai-kimi`, `ai-glm`, `ai-eltex`, `ai-eltex-qwen`, `ai-mimo`, `ai-qwen`, `ai-openrouter`, `ai-opencode`, `ai-gemini`, `ai-cursor`
 в `~/bin`, если он уже есть в `PATH`, иначе в `~/.local/bin/`, и запишет API-ключи.
 
 После установки, если команды не видны: