🐛 fix(setup): detect Homebrew download failure and verify installation

Split curl download from bash execution so network errors are caught
explicitly. Add post-install verification that brew is actually
available before reporting success.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

linux-managements/setup.sh

@@ -167,12 +167,25 @@ install_homebrew() {
         return
     fi
     info "Installing Homebrew ..."
-    /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+    local install_script
+    install_script="$(mktemp)"
+    if ! curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh -o "$install_script"; then
+        rm -f "$install_script"
+        error "Failed to download Homebrew install script (network error)"
+        exit 1
+    fi
+    /bin/bash "$install_script"
+    rm -f "$install_script"
 
     # Add brew to PATH for the rest of this script
     if [ -f /home/linuxbrew/.linuxbrew/bin/brew ]; then
         eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
     fi
+
+    if ! command -v brew &>/dev/null; then
+        error "Homebrew installation failed (brew not found after install)"
+        exit 1
+    fi
     success "Homebrew installed"
 }
 
@@ -283,15 +296,19 @@ install_docker() {
             if command -v docker &>/dev/null; then
                 info "Docker already installed ($(docker --version)), skipping"
             else
-                info "Downloading Docker install script ..."
-                curl -fsSL https://config.mitsea.com/install-docker.sh -o /tmp/install-docker.sh
-
                 echo ""
-                echo -e "Use a ${BOLD}mirror${NC} for Docker installation? ${YELLOW}(recommended in China)${NC}"
-                read -rp "Use nyist mirror? [y/N] " use_mirror
+                echo -e "Use a ${BOLD}domestic mirror${NC} for Docker installation? ${YELLOW}(recommended in China)${NC}"
+                read -rp "Use mirror? [y/N] " use_mirror
                 case "$use_mirror" in
-                    [Yy]*) sudo sh /tmp/install-docker.sh --mirror nyist ;;
-                    *)     sudo sh /tmp/install-docker.sh ;;
+                    [Yy]*)
+                        curl -fsSL https://git.mitsea.com/FlintyLemming/scripts-public/raw/branch/main/linux-managements/install-docker.sh \
+                            -o /tmp/install-docker.sh
+                        sudo sh /tmp/install-docker.sh --mirror nyist
+                        ;;
+                    *)
+                        curl -fsSL https://get.docker.com -o /tmp/get-docker.sh
+                        sudo sh /tmp/get-docker.sh
+                        ;;
                 esac
                 success "Docker installed"
             fi