add uv install to init.sh

{{cookiecutter.project_slug}}/init.sh

@@ -1,6 +1,32 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
-set -e
+if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
+    echo "Source this script so it can activate the virtualenv:"
+    echo "  source ./init.sh"
+    exit 1
+fi
 
-uv sync --all-groups
-source .venv/bin/activate
+repo_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)" || return 1
+cd "$repo_dir" || return 1
+export PATH="$HOME/.local/bin:$PATH"
+
+if ! command -v uv >/dev/null 2>&1; then
+    if ! command -v curl >/dev/null 2>&1; then
+        echo "curl is required to install uv" >&2
+        return 1
+    fi
+
+    echo "Installing uv..."
+    curl -LsSf https://astral.sh/uv/install.sh | sh || return 1
+    hash -r
+fi
+
+echo "Syncing project environment..."
+uv sync || return 1
+
+# shellcheck disable=SC1091
+source .venv/bin/activate || return 1
+
+echo
+echo "Environment ready."
+echo "Use 'inv --list' or 'uv run inv --list' to see available tasks."