music(chord): yopu UI 升级修 selector + 加 PVC override 与调试 dump

- yopu 现在搜索结果默认全是和弦谱（不再标「和弦谱」字样），改成直接取第一个 a.post-main
- chord_server 启动时把 /data/chord-overrides/ 加到 sys.path 优先级最高，方便后续不 rebuild image 直接 cp yopu.py 热修
- 失败路径 dump HTML + 截图到 /data/chord-debug，view 页 selector 失败也能事后看

apps/music/chord/yopu.py

@@ -55,40 +55,53 @@ def setup_driver(window="1920,5000"):
 
 
 def find_first_chord_chart(driver, search_url):
-    """在搜索页找第一个「和弦谱」结果，返回 view url 和 title。"""
+    """在搜索页找第一个结果（yopu 现在默认全部是和弦谱），返回 view url 和 title。
+
+    旧版 yopu UI 在 .one-line-info 里有「和弦谱」字样可以过滤，
+    新版（svelte 重写后）已经没有，只有调号 (G调/C调/F调)。直接取第一个 a.post-main。
+    """
     logger.info("loading search: %s", search_url)
     driver.get(search_url)
     time.sleep(3)
 
-    chord_links = driver.execute_script("""
-        var hits = [];
+    hits = driver.execute_script("""
+        var out = [];
         var posts = document.querySelectorAll('a.post-main');
         for (var i = 0; i < posts.length; i++) {
-            var info = posts[i].querySelector('.one-line-info');
-            var t = info ? (info.textContent || info.innerText || '') : '';
-            if (t.indexOf('和弦') >= 0 && t.indexOf('谱') >= 0) {
-                hits.push({
-                    href: posts[i].href,
-                    title: (posts[i].querySelector('.title-line .title, .title') || {}).textContent || '',
-                    text: t.trim(),
-                });
-            }
+            var p = posts[i];
+            var titleEl = p.querySelector('.title-line .title, .title');
+            var subEl = p.querySelector('.title-line .subtitle, .subtitle');
+            var info = p.querySelector('.one-line-info');
+            out.push({
+                href: p.href,
+                title: titleEl ? (titleEl.textContent || '').trim() : '',
+                subtitle: subEl ? (subEl.textContent || '').trim() : '',
+                info: info ? (info.textContent || '').trim() : '',
+            });
         }
-        return hits;
+        return out;
     """)
 
-    if not chord_links:
-        logger.warning("no '和弦谱' hits in search results")
+    if not hits:
+        logger.warning("no a.post-main found in search results — yopu DOM changed?")
         return None
-    first = chord_links[0]
+
+    # MVP：直接取第一个。前 N 个一般是同一首歌的不同 key (G/C/F)，第一个通常是默认 key。
+    first = hits[0]
     href = first['href']
     if href.startswith('/'):
         p = urlparse(search_url)
         href = f"{p.scheme}://{p.netloc}{href}"
     elif not href.startswith('http'):
         href = urljoin(search_url, href)
-    logger.info("matched: %s — %s", first.get('title'), href)
-    return {'url': href, 'title': first.get('title') or '', 'text': first.get('text') or ''}
+    logger.info("matched %d/%d hits, picking #1: %s — %s [%s]",
+                1, len(hits), first.get('title'), first.get('subtitle'), first.get('info'))
+    return {
+        'url': href,
+        'title': first.get('title') or '',
+        'subtitle': first.get('subtitle') or '',
+        'text': first.get('info') or '',
+    }
 
 
 def select_option_in_row(driver, row_label, button_text, timeout=10):
@@ -217,6 +230,21 @@ def crop_white(path, pad_top=20, pad_bottom=50, pad_left=20, pad_right=20, white
     logger.info("cropped to %s", box)
 
 
+DEBUG_DIR = Path('/data/chord-debug')
+
+
+def _save_debug(driver, tag: str):
+    """失败时 dump 当前 HTML + 截图到 /data/chord-debug 方便排查。"""
+    try:
+        DEBUG_DIR.mkdir(parents=True, exist_ok=True)
+        ts = int(time.time())
+        (DEBUG_DIR / f'{tag}-{ts}.html').write_text(driver.page_source, encoding='utf-8')
+        driver.save_screenshot(str(DEBUG_DIR / f'{tag}-{ts}.png'))
+        logger.info("debug snapshot saved: %s/%s-%d.{html,png}", DEBUG_DIR, tag, ts)
+    except Exception as e:
+        logger.warning("debug snapshot failed: %s", e)
+
+
 def fetch_chord_chart(query: str, output_path: str, *,
                       sheet_style: str = '功能谱',
                       chord_style: str = '级数名',
@@ -236,6 +264,7 @@ def fetch_chord_chart(query: str, output_path: str, *,
         driver = setup_driver()
         result = find_first_chord_chart(driver, search_url)
         if not result:
+            _save_debug(driver, 'no-search-hit')
             return False, '未找到和弦谱'
         view_url = result['url']
 
@@ -244,16 +273,23 @@ def fetch_chord_chart(query: str, output_path: str, *,
         time.sleep(3)
 
         # 选样式（写死的 MVP 组合）
-        select_option_in_row(driver, '谱面样式', sheet_style)
-        select_option_in_row(driver, '和弦样式', chord_style)
+        sheet_ok = select_option_in_row(driver, '谱面样式', sheet_style)
+        chord_ok = select_option_in_row(driver, '和弦样式', chord_style)
+        if not (sheet_ok and chord_ok):
+            # 选不上 = UI 改了，dump 给 debug
+            _save_debug(driver, 'row-not-found')
 
         # 等内容刷新
         time.sleep(1.5)
 
         wait = WebDriverWait(driver, 15)
-        sheet = wait.until(EC.presence_of_element_located(
-            (By.CSS_SELECTOR, "div.sheet-container")
-        ))
+        try:
+            sheet = wait.until(EC.presence_of_element_located(
+                (By.CSS_SELECTOR, "div.sheet-container")
+            ))
+        except TimeoutException:
+            _save_debug(driver, 'no-sheet-container')
+            raise
 
         driver.execute_script("arguments[0].scrollIntoView(true);", sheet)
         time.sleep(0.5)