refactor(update): switch to github releases and curl

[tusharmath]

Summary

Replace npm-based installation and update mechanism with GitHub releases and the official installation script, providing a more reliable and platform-agnostic update experience.

Context

The update system previously relied on npm for both installation (npx forgecode@latest) and updates (npm update -g forgecode --force). This approach had several limitations:

• Required npm to be installed on the user's system
• Version checking was done via npm registry instead of GitHub releases
• Inconsistent with the actual binary distribution method (GitHub releases)

The official installation script (curl -fsSL https://forgecode.dev/install.sh | sh) is the recommended method for installing Forge and handles platform detection, binary downloads, and dependency installation (fzf, bat, fd) automatically.

Changes

• README.md: Updated installation command from npx forgecode@latest to curl -fsSL https://forgecode.dev/install.sh | sh
• crates/forge_main/src/update.rs:
  • Changed version check registry from registry::Crates to registry::GitHub with repo "antinomyhq/forge"
  • Updated update command to use the official installation script instead of npm
• crates/forge_main/Cargo.toml: Changed update-informer feature from "crates" to "github"

Key Implementation Details

The update system now:

1. Checks for new versions by querying GitHub releases at antinomyhq/forge
2. When an update is available and confirmed (or auto-update is enabled), executes the official installation script
3. The script handles platform detection (aarch64-apple-darwin, x86_64-unknown-linux-gnu, etc.) and downloads the appropriate binary

Use Cases

• Users can install Forge without npm by running curl -fsSL https://forgecode.dev/install.sh | sh
• Update mechanism now checks the actual release version from GitHub releases
• Consistent installation and update experience across different platforms

Testing

# Verify the code compiles
cargo check

# Run update-related tests
cargo test --package forge_main --lib update

# Verify installation script works
curl -fsSL https://forgecode.dev/install.sh | sh

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✅ tusharmath
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[amitksingh1490]

if someone has already installed using npm,we should use npm for update

[github-actions]

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