Initial commit: SAP C4C attachment downloader toolkit

- Add Python script for downloading C4C attachments via OData and web scraping
- Add Java wrapper for programmatic access with typed API
- Add DSM upload utility for Synology NAS integration
- Add CLAUDE.md documentation for future development
- Add .gitignore for Python, Java, and sensitive files

dsm-upload.py

@@ -0,0 +1,43 @@
+import requests
+import urllib3
+urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
+
+NAS = "http://10.0.10.235:5000"
+USER = "PLM"
+PWD = "123456"
+
+# 1) 登录
+login_url = f"{NAS}/webapi/auth.cgi"
+login_params = {
+    "api": "SYNO.API.Auth",
+    "version": "3",
+    "method": "login",
+    "account": USER,
+    "passwd": PWD,
+    "session": "FileStation",
+    "format": "sid",
+}
+r = requests.get(login_url, params=login_params, verify=False)
+r.raise_for_status()
+data = r.json()
+sid = data["data"]["sid"]
+
+# 2) 上传（SID 通过 cookie 传递）
+upload_url = f"{NAS}/webapi/entry.cgi"
+form = {
+    "api": "SYNO.FileStation.Upload",
+    "version": "2",
+    "method": "upload",
+    "path": "/Newgonow/AU-SPFJ",
+    "create_parents": "true",
+    "overwrite": "true",
+}
+with open("downloads/IMG_4307.mp4", "rb") as f:
+    files = {
+        "file": ("IMG_4307.mp4", f, "video/mp4")
+    }
+    r = requests.post(upload_url, data=form, files=files,
+                      cookies={"id": sid}, verify=False)
+
+print(r.status_code)
+print(r.text)