Fix DeleteResource API call for casdoor-go-sdk v0.40.0

[Copilot]

The SDK upgrade changed DeleteResource from accepting a string to requiring a *Resource object, breaking the build.

Changes

• Updated DeleteFileFromStorage in service/oss.go to construct a Resource object for the new API
• Set Name field to the filePath; Owner field left empty for SDK auto-fill

// Before
affected, err := casdoorsdk.DeleteResource(filePath)

// After  
resource := &casdoorsdk.Resource{
    Name: filePath,
}
affected, err := casdoorsdk.DeleteResource(resource)

The SDK implementation automatically populates empty Owner fields with the configured organization name, avoiding circular dependency issues between service and object packages.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[bug] fix the bugs after uprading casdoor-go-sdk to v0.40.0</issue_title>
<issue_description>after uprading casdoor-go-sdk to v0.40.0 in commit: 2267b8a

it causes the error in CI: https://github.com/casdoor/casnode/actions/runs/20212324513/job/58020005887

Run go build -race -ldflags "-extldflags '-static'"
  go build -race -ldflags "-extldflags '-static'"
  shell: /usr/bin/bash -e {0}
go: downloading github.com/astaxie/beego v1.12.3
go: downloading github.com/casdoor/casdoor-go-sdk v0.40.0
go: downloading github.com/go-sql-driver/mysql v1.5.0
go: downloading xorm.io/core v0.7.2
go: downloading xorm.io/xorm v0.8.1
go: downloading github.com/casbin/google-groups-crawler v0.1.3
go: downloading github.com/gomarkdown/markdown v0.0.0-20210408062403-ad838ccf8cdd
go: downloading github.com/microcosm-cc/bluemonday v1.0.5
go: downloading github.com/mileusna/crontab v1.0.1
go: downloading github.com/sromku/go-gitter v0.0.0-20170828210750-70f7030a94a6
go: downloading golang.org/x/net v0.16.0
go: downloading github.com/chromedp/chromedp v0.13.2
go: downloading github.com/huichen/sego v0.0.0-20180617034105-3f3c8a8cfacc
go: downloading github.com/mozillazg/go-slugify v0.2.0
go: downloading github.com/hashicorp/golang-lru v0.5.4
go: downloading github.com/prometheus/client_golang v1.11.0
go: downloading golang.org/x/crypto v0.14.0
go: downloading github.com/gomodule/redigo v2.0.0+incompatible
go: downloading github.com/golang-jwt/jwt/v4 v4.5.0
go: downloading github.com/google/uuid v1.6.0
go: downloading golang.org/x/oauth2 v0.13.0
go: downloading github.com/shiena/ansicolor v0.0.0-20200904210342-c7312218db18
go: downloading xorm.io/builder v0.3.6
go: downloading github.com/chris-ramon/douceur v0.2.0
go: downloading github.com/mreiferson/go-httpclient v0.0.0-20201222173833-5e475fde3a4d
go: downloading github.com/mrexodia/wray v0.0.0-20160318003008-78a2c1f284ff
go: downloading gopkg.in/yaml.v2 v2.4.0
go: downloading github.com/chromedp/cdproto v0.0.0-20250319231242-a755498943c8
go: downloading github.com/go-json-experiment/json v0.0.0-20250211171154-1ae217ad3535
go: downloading github.com/gobwas/ws v1.4.0
go: downloading github.com/mozillazg/go-unidecode v0.1.1
go: downloading github.com/prometheus/client_model v0.2.0
go: downloading github.com/prometheus/common v0.26.0
go: downloading github.com/adamzy/cedar-go v0.0.0-20170805034717-80a9c64b256d
go: downloading github.com/aymerick/douceur v0.2.0
go: downloading github.com/gorilla/css v1.0.0
go: downloading github.com/chromedp/sysutil v1.1.0
go: downloading github.com/gobwas/httphead v0.1.0
go: downloading github.com/gobwas/pool v0.2.1
go: downloading github.com/beorn7/perks v1.0.1
go: downloading github.com/cespare/xxhash/v2 v2.1.1
go: downloading github.com/golang/protobuf v1.5.3
go: downloading github.com/prometheus/procfs v0.6.0
go: downloading golang.org/x/text v0.13.0
go: downloading github.com/matttproud/golang_protobuf_extensions v1.0.1
go: downloading google.golang.org/protobuf v1.31.0
go: downloading golang.org/x/sys v0.29.0
# github.com/casbin/casnode/service
Error: service/oss.go:50:45: cannot use filePath (variable of type string) as *casdoorsdk.Resource value in argument to casdoorsdk.DeleteResource
Error: Process completed with exit code 1.
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes [bug] fix the bugs after uprading casdoor-go-sdk to v0.40.0 #8

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