fix(install): Warn when another flagsmith on PATH may shadow the install

[khvn26]

Closes #75.

In this PR, we add the following installer script improvements:

• The installer detects existing flagsmith command, walks the PATH to identify each conflicting binary, and lists them with a warning.
• Reinstalling over existing ${INSTALL_DIR}/flagsmith produces no warning, and the final message now distinguishes the two cases: installed <version> to <path> on first install, updated <version> at <path> when overwriting.

Fresh install with an old CLI still on PATH:

$ curl -fsSL https://get.flagsmith.com | sh
downloading flagsmith v2.0.0 (darwin/arm64)
installed flagsmith version 2.0.0 to /Users/alice/.local/bin/flagsmith
warning: another 'flagsmith' is on your PATH at /usr/local/bin/flagsmith
It may shadow /Users/alice/.local/bin/flagsmith — uninstall it first ('npm uninstall -g flagsmith-cli' removes the old npm CLI), then run 'hash -r' or open a new shell.

Run 'flagsmith init' to get started.

Re-running the installer over an existing v2 binary (the smooth update path — no warning):

$ curl -fsSL https://get.flagsmith.com | sh
downloading flagsmith v2.0.0 (darwin/arm64)
updated flagsmith version 2.0.0 at /Users/alice/.local/bin/flagsmith

Run 'flagsmith init' to get started.

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Reviewing files that changed from the base of the PR and between fc3300a and 1a183d8.

📒 Files selected for processing (2)

• install.ps1
• install.sh

📝 Walkthrough

Walkthrough

The shell and PowerShell installers now distinguish between new and existing installations. They report the installed version and executable location. They detect other flagsmith executables on PATH and display conflict warnings. The shell installer compares executable paths before reporting conflicts. Both installers perform conflict reporting after installation verification.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🟡 Moderate · up to fc330

The installer’s new shadowing warnings can be incorrect on Windows and incomplete on Unix-like systems, either flagging non-executable commands or missing a conflicting binary in the current directory. These bounded correctness issues should be fixed before merge.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

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• install.sh

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[matthewelwell]

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