feat(feishu): render markdown tables as JSON 2.0 cards

gateway/platforms/feishu.py

@@ -4179,8 +4179,16 @@ def _build_outbound_payload(self, content: str) -> tuple[str, str]:
         # table content as post causes the message to appear blank on the client.
         # Force plain text for anything that looks like a markdown table.
         if _MARKDOWN_TABLE_RE.search(content):
-            text_payload = {"text": content}
-            return "text", json.dumps(text_payload, ensure_ascii=False)
+            # JSON 2.0 card renders markdown tables natively with borders and alignment.
+            card = {
+                "schema": "2.0",
+                "body": {
+                    "elements": [
+                        {"tag": "markdown", "content": content}
+                    ]
+                },
+            }
+            return "interactive", json.dumps(card, ensure_ascii=False)
         if _MARKDOWN_HINT_RE.search(content):
             return "post", _build_markdown_post_payload(content)
         text_payload = {"text": content}