prevent writing to config regardless of cwd

[dskvr]

No description provided.

[Copilot]

Pull request overview

This PR aims to prevent tests from writing to the real project .nsite/config.json regardless of the current working directory by adding an explicit “test mode” signal and strengthening write guards in config writing code.

Changes:

• Add DENO_TESTING env flag in global test setup and use it in writeProjectFile to block default config writes during tests.
• Add additional guarding in writeProjectFile to prevent tests from writing to non-temp paths even when configPath is explicitly provided.
• Change deploy upload server resolution to stop merging in the user’s kind 10063 Blossom server list, and update the repo’s .nsite/config.json server list.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 7 comments.

File	Description
tests/test-setup-global.ts	Sets a new env flag intended to identify the test runtime.
src/lib/config.ts	Updates config-writing logic to detect test mode and block writes to “real” paths.
src/commands/deploy.ts	Changes how upload servers are resolved (no longer merges user 10063 server list).
.nsite/config.json	Updates the checked-in project config server list.

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