dsh-web-fetch-fakeip: Solving Web Fetch Issues in mihomo/Clash TUN Mode

`dsh-web-fetch-fakeip` is a plugin for DeepSeek Harness (DSH) that resolves the issue where the standard WebFetchProvider rejects requests when fake-ip DNS is used in TUN mode because it cannot resolve reserved addresses such as `198.18.0.0/15`. By reusing the standard transport layer and replacing the destination policy, it is compatible with the default fake-ip ranges used by mihomo/Clash. Installation via the `dsh plugin` command is recommended; after installation, restart to apply the configuration. If loading fails, update the DSH version or the plugin.