Import 9 alphaear finance skills

- alphaear-deepear-lite: DeepEar Lite API integration
- alphaear-logic-visualizer: Draw.io XML finance diagrams
- alphaear-news: Real-time finance news (10+ sources)
- alphaear-predictor: Kronos time-series forecasting
- alphaear-reporter: Professional financial reports
- alphaear-search: Web search + local RAG
- alphaear-sentiment: FinBERT/LLM sentiment analysis
- alphaear-signal-tracker: Signal evolution tracking
- alphaear-stock: A-Share/HK/US stock data

Updates:
- All scripts updated to use universal .env path
- Added JINA_API_KEY, LLM_*, DEEPSEEK_API_KEY to .env.example
- Updated load_dotenv() to use ~/.config/opencode/.env

skills/alphaear-signal-tracker/scripts/utils/content_extractor.py

@@ -0,0 +1,122 @@
+import requests
+from requests.exceptions import RequestException, Timeout, ConnectionError
+import os
+import time
+import json
+import threading
+from typing import Optional
+from loguru import logger
+
+
+class ContentExtractor:
+    """内容提取工具 - 主要接入 Jina Reader API"""
+    
+    JINA_BASE_URL = "https://r.jina.ai/"
+    
+    # 速率限制配置 (无 API Key 时：20 次/分钟)
+    _rate_limit_no_key = 20  # 每分钟最大请求数
+    _rate_window = 60.0  # 时间窗口（秒）
+    _min_interval = 3.0  # 请求最小间隔（秒）
+    
+    # 类级别的速率限制状态
+    _request_times = []
+    _last_request_time = 0.0
+    _lock = threading.Lock()
+
+    @classmethod
+    def _wait_for_rate_limit(cls, has_api_key: bool) -> None:
+        """等待以满足速率限制要求"""
+        if has_api_key:
+            # 有 API Key 时，只需保持最小间隔
+            time.sleep(0.5)
+            return
+        
+        with cls._lock:
+            current_time = time.time()
+            
+            # 1. 清理过期的请求记录
+            cls._request_times = [t for t in cls._request_times if current_time - t < cls._rate_window]
+            
+            # 2. 检查是否达到速率限制
+            if len(cls._request_times) >= cls._rate_limit_no_key:
+                # 需要等待最旧的请求过期
+                oldest = cls._request_times[0]
+                wait_time = cls._rate_window - (current_time - oldest) + 1.0
+                if wait_time > 0:
+                    logger.warning(f"⏳ Jina rate limit reached, waiting {wait_time:.1f}s...")
+                    time.sleep(wait_time)
+                    current_time = time.time()
+                    cls._request_times = [t for t in cls._request_times if current_time - t < cls._rate_window]
+            
+            # 3. 确保请求间隔不太快
+            time_since_last = current_time - cls._last_request_time
+            if time_since_last < cls._min_interval:
+                sleep_time = cls._min_interval - time_since_last
+                time.sleep(sleep_time)
+            
+            # 4. 记录本次请求
+            cls._request_times.append(time.time())
+            cls._last_request_time = time.time()
+
+    @classmethod
+    def extract_with_jina(cls, url: str, timeout: int = 30) -> Optional[str]:
+        """
+        使用 Jina Reader 提取网页正文内容 (Markdown 格式)
+        
+        无 API Key 时自动限速：每分钟最多 20 次请求，每次间隔至少 3 秒
+        """
+        if not url or not url.startswith("http"):
+            return None
+            
+        logger.info(f"🕸️ Extracting content from: {url} via Jina...")
+        
+        headers = {
+            "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36",
+            "Accept": "application/json"
+        }
+        
+        # 使用统一的 JINA_API_KEY
+        api_key = os.getenv("JINA_API_KEY")
+        has_api_key = bool(api_key and api_key.strip())
+        
+        if has_api_key:
+            headers["Authorization"] = f"Bearer {api_key}"
+        
+        # 等待速率限制
+        cls._wait_for_rate_limit(has_api_key)
+
+        try:
+            # Jina Reader API
+            full_url = f"{cls.JINA_BASE_URL}{url}"
+            response = requests.get(full_url, headers=headers, timeout=timeout)
+            
+            if response.status_code == 200:
+                try:
+                    data = response.json()
+                    # Jina JSON 响应格式通常在 data.content
+                    if isinstance(data, dict) and "data" in data:
+                        return data["data"].get("content", "")
+                    return data.get("content", response.text)
+                except (json.JSONDecodeError, TypeError):
+                    return response.text
+            elif response.status_code == 429:
+                # 触发速率限制，等待后重试一次
+                logger.warning(f"⚠️ Jina rate limit (429), waiting 60s before retry...")
+                time.sleep(60)
+                return cls.extract_with_jina(url, timeout)
+            else:
+                logger.warning(f"Jina extraction failed (Status {response.status_code}) for {url}")
+                return None
+                
+        except Timeout:
+            logger.error(f"Timeout during Jina extraction for {url}")
+            return None
+        except ConnectionError:
+            logger.error(f"Connection error during Jina extraction for {url}")
+            return None
+        except RequestException as e:
+            logger.error(f"Request error during Jina extraction: {e}")
+            return None
+        except Exception as e:
+            logger.error(f"Unexpected error during Jina extraction: {e}")
+            return None