revert: "feat: add uv sync offline flag (#624)" and "fix: fix uv offline set position (#644)"

[kurokobo]

Description

Closes #649

This PR reverts following two PRs to support --offline switch for uv sync command.

• feat: add uv sync offline flag #624
• fix: fix uv offline set position #644

There was an issue with #624 and #644 where, regardless of the installation method, uv sync --offline would always be attempted for all plugins that have a pyproject.toml file, causing even regular installations from the marketplace to fail.

We will revert these two PRs.
Instead, by creating a difypkg file for offline installation as follows, users can install plugins offline.

• For projects with a pyproject.toml, add no-index and find-links under [tool.uv] in the file (see feat: support uv to download package junjiem/dify-plugin-repackaging#60 (comment))
• For projects that only have a requirements.txt, just as current implementation of re-packager, add --no-index and --find-links as the first lines of the file

With this, the Plugin Daemon can support offline installation for difypkg without any special implementation.

Type of Change

• Bug fix
• New feature
• Refactor
• Performance improvement
• Other

Essential Checklist

Testing

• I have tested the changes locally and confirmed they work as expected
• I have added unit tests where necessary and they pass successfully

Bug Fix (if applicable)

• I have used GitHub syntax to close the related issue (e.g., Fixes #123 or Closes #123)

Additional Information

• feat: support uv to download package junjiem/dify-plugin-repackaging#60

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses critical issues with uv sync --offline functionality by reverting two previous changes that inadvertently broke regular plugin installations. It introduces a more robust and flexible approach for offline plugin installation, enabling users to install plugins offline via difypkg files with specific configuration, thereby simplifying the Plugin Daemon's internal logic and improving overall stability.

Highlights

• Reverted Previous Changes: Two prior pull requests (feat: add uv sync offline flag #624 and fix: fix uv offline set position #644) that introduced uv sync --offline functionality were reverted.
• Addressed Installation Failures: The previous implementation caused uv sync --offline to fail for regular marketplace installations when pyproject.toml was present.
• New Offline Installation Strategy: A new method for offline plugin installation is introduced, leveraging difypkg files and specific configurations (--no-index, --find-links) within pyproject.toml or requirements.txt.
• Simplified Plugin Daemon: The Plugin Daemon no longer requires special implementation to support offline installation for difypkg.

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[gemini-code-assist]

Code Review

This pull request reverts two previous features that added an --offline flag to the uv sync command. The changes correctly remove the logic for adding this flag, along with associated helper functions, caching mechanisms, and tests. This aligns with the goal of handling offline installations outside of the plugin daemon as described.

I've added one comment regarding the removal of godotenv, which seems unrelated to the revert and could impact local development setups. Otherwise, the revert is implemented correctly.