Update API documentation with SEC filings endpoints

Add SEC Filings section to root HTML docs, example requests, key features,
and OpenAPI tags for Swagger UI / ReDoc visibility.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/main.py

@@ -152,6 +152,13 @@ async def root_documentation():
                 <li><code>GET /news/{{ticker}}/social-only</code> - Social media posts only</li>
             </ul>
 
+            <h3>SEC Filings <span class="new-badge">NEW</span></h3>
+            <ul>
+                <li><code>GET /filings/search/{{ticker}}</code> - Search SEC filings (8-K, 6-K, 20-F, 40-F, 10-K, 10-Q)</li>
+                <li><code>GET /filings/documents/{{accession_number}}</code> - List all documents in a filing</li>
+                <li><code>GET /filings/exhibit/{{accession_number}}</code> - Extract exhibit content (e.g., EX-99.1 press releases)</li>
+            </ul>
+
             <h3>ETF Holdings</h3>
             <ul>
                 <li><code>GET /etf/holdings/{{ticker}}</code> - ETF holdings at date or most recent</li>
@@ -192,6 +199,20 @@ curl "http://localhost:18001/api/v1/price/intraday/AAPL?interval=1m&period=1d"
 # Today's OHLC (daily if available; otherwise 1m aggregate)
 curl "http://localhost:18001/api/v1/price/today/AAPL"</code></pre>
 
+            <h3>SEC Filings <span class="new-badge">NEW</span></h3>
+            <pre><code># Search AAPL 8-K filings (earnings announcements, material events)
+curl "http://localhost:18001/api/v1/filings/search/AAPL?form_type=8-K&limit=5"
+
+# Search foreign issuer filings
+curl "http://localhost:18001/api/v1/filings/search/TSM?form_type=20-F"
+curl "http://localhost:18001/api/v1/filings/search/SAP?form_type=6-K"
+
+# List all documents in a filing
+curl "http://localhost:18001/api/v1/filings/documents/0000320193-26-000005"
+
+# Extract press release (Exhibit 99.1) from an 8-K
+curl "http://localhost:18001/api/v1/filings/exhibit/0000320193-26-000005?exhibit_type=EX-99.1"</code></pre>
+
             <h3>ETF Holdings</h3>
             <pre><code>curl "http://localhost:18001/api/v1/etf/holdings/QQQ"</code></pre>
 
@@ -212,7 +233,8 @@ news = client.get_news_social_data("AAPL", days_back=7)</code></pre>
 
             <h2>📈 Key Features</h2>
             <ul>
-                <li><strong>SEC EDGAR Data</strong> - Official company filings (10-K, 10-Q)</li>
+                <li><strong>SEC EDGAR Data</strong> - Official company filings (10-K, 10-Q) with XBRL financial data</li>
+                <li><strong>SEC Filings Search</strong> - Index and search 8-K, 6-K, 20-F, 40-F filings with exhibit extraction</li>
                 <li><strong>Real-time News</strong> - Yahoo Finance + NewsAPI integration</li>
                 <li><strong>Social Sentiment</strong> - Reddit discussions and sentiment analysis</li>
                 <li><strong>ETF Holdings</strong> - Complete ETF portfolio analysis via N-PORT</li>
@@ -265,6 +287,10 @@ app.openapi_tags = [
         "name": "metadata",
         "description": "Data catalog and metadata endpoints"
     },
+    {
+        "name": "filings",
+        "description": "SEC filings search, document listing, and exhibit extraction (8-K, 6-K, 20-F, 40-F)"
+    },
     {
         "name": "etf",
         "description": "ETF holdings endpoints"