MiMo AI 能力扩展：TAF解读、概率分布解读、异常检测、市场概览

AI 解读字段扩展:
    - 新增 taf_read_zh/en：解读机场预报中影响今日峰值窗口的变化
    - 新增 probability_read_zh/en：描述概率分布形态（最高桶、偏左/偏右）
    - stream max_tokens 900→1200 容纳新输出字段
    - 缓存 key 简化为 METAR原文+观测时间，大幅提升命中率
    - 兜底函数补全 TAF 和概率字段的确定性生成

    异常检测:
    - 纯数学计算，零 AI 延迟：实测温度 vs 全部模型预测上下限
    - 三级告警：breakout_above / breakout_below / deviation

    市场概览:
    - 新增 POST /api/scan/terminal/overview（MiMo 批量解读，缓存10分钟）
    - 前端 MarketOverviewBanner 可折叠横幅（顶栏与标签栏之间）
    - 移动端适配 640px/768px 断点，暗色/亮色双主题

    Scope-risk: MEDIUM — 170 测试通过，TypeScript 零错误，ruff 零告警
    Tested: python -m pytest -q (170 passed), npx tsc --noEmit (0 errors), ruff check .

web/scan_city_ai_helpers.py

@@ -7,6 +7,10 @@ from typing import Any, Dict, List, Optional
 CITY_AI_REQUIRED_FIELDS = [
     "metar_read_zh",
     "metar_read_en",
+    "taf_read_zh",
+    "taf_read_en",
+    "probability_read_zh",
+    "probability_read_en",
     "final_judgment_zh",
     "final_judgment_en",
     "predicted_max",
@@ -25,6 +29,10 @@ CITY_AI_REQUIRED_FIELDS = [
 CITY_AI_STREAM_PROVIDER_FIELDS = [
     "metar_read_zh",
     "metar_read_en",
+    "taf_read_zh",
+    "taf_read_en",
+    "probability_read_zh",
+    "probability_read_en",
     "predicted_max",
     "range_low",
     "range_high",
@@ -121,6 +129,10 @@ def _extract_json_string_field_fragment(raw_text: str, field: str) -> tuple[str,
 _CITY_AI_TEXT_FIELDS = {
     "metar_read_zh",
     "metar_read_en",
+    "taf_read_zh",
+    "taf_read_en",
+    "probability_read_zh",
+    "probability_read_en",
     "final_judgment_zh",
     "final_judgment_en",
     "reasoning_zh",
@@ -270,6 +282,10 @@ def _city_ai_response_example(unit: str) -> Dict[str, Any]:
     return {
         "metar_read_zh": f"最新观测显示 37.0{unit or '°C'}，观测时间 04:30Z；风和云量暂未显示强降温信号，后续观测用于确认升温路径。",
         "metar_read_en": f"The latest observation shows 37.0{unit or '°C'} at 04:30Z; wind and cloud signals do not yet show a strong cooling break, so later observations should confirm the warming path.",
+        "taf_read_zh": "TAF 预报 14-16Z BECMG 18012KT，午后风向切换为海风可能抑制升温。",
+        "taf_read_en": "TAF shows BECMG 18012KT during 14-16Z; afternoon onshore wind shift may cap warming.",
+        "probability_read_zh": f"概率分布偏右，最高概率桶 42-43{unit or '°C'}（~35%），上方尾部延至 45{unit or '°C'}。",
+        "probability_read_en": f"Distribution skews right; peak bucket 42-43{unit or '°C'} (~35%), upper tail to 45{unit or '°C'}.",
         "final_judgment_zh": f"预计最高温暂以 43.0{unit or '°C'} 附近为中枢。",
         "final_judgment_en": f"The expected daily high is centered near 43.0{unit or '°C'}.",
         "predicted_max": 43.0,
@@ -290,6 +306,10 @@ def _city_ai_stream_response_example(unit: str) -> Dict[str, Any]:
     return {
         "metar_read_zh": f"最新 METAR 显示 37.0{unit or '°C'}，报文时间 04:30Z；风和云量暂未显示强降温信号，后续报文用于确认升温路径。",
         "metar_read_en": f"The latest METAR shows 37.0{unit or '°C'} at 04:30Z; wind and cloud signals do not yet show a strong cooling break, so later reports should confirm the warming path.",
+        "taf_read_zh": "TAF 预报 14-16Z BECMG 18012KT，午后风向转为海风可能抑制升温，需关注。",
+        "taf_read_en": "TAF shows BECMG 18012KT during 14-16Z; afternoon onshore wind shift may cap further warming.",
+        "probability_read_zh": f"概率分布偏右，最高概率桶 42-43{unit or '°C'}（~35%），上方尾部延至 45{unit or '°C'}。",
+        "probability_read_en": f"Distribution skews right; peak bucket 42-43{unit or '°C'} (~35%), upper tail extends to 45{unit or '°C'}.",
         "predicted_max": 43.0,
         "range_low": 42.0,
         "range_high": 44.0,