fix(skills/py): adapter-coze Docker example port consistency

Review by @chatgpt-codex-connector flagged: docker run -p 9000:9000
published host port 9000, but ENV PORT=8000 and os.getenv("PORT","8000")
kept container listening on 8000. Host requests to 9000 would hit nothing.

First-pass sed only caught `port=8000` literal; missed:
- os.getenv("PORT", "8000") default value
- ENV PORT=8000 Dockerfile directive
- "port": 8000 config example

All 8000 occurrences in the Python skill dir now unified to 9000.

Author: binggg

config/source/skills/cloudbase-agent/py/adapter-coze.md

@@ -278,7 +278,7 @@ app.use(auth_middleware)
 if __name__ == "__main__":
     app.run(
         create_agent,
-        port=int(os.getenv("PORT", "8000")),
+        port=int(os.getenv("PORT", "9000")),
         host="0.0.0.0"
     )
 ```
@@ -307,7 +307,7 @@ RUN pip install -r requirements.txt
 
 COPY . .
 
-ENV PORT=8000
+ENV PORT=9000
 
 CMD ["python", "app.py"]
 ```
@@ -331,7 +331,7 @@ docker run -p 9000:9000 \
     "name": "coze-agent",
     "path": "./",
     "runtime": "Python3.9",
-    "port": 8000,
+    "port": 9000,
     "env": {
       "COZE_BOT_ID": "${COZE_BOT_ID}",
       "COZE_API_KEY": "${COZE_API_KEY}",