feat: add uninstaller scripts for all tools + restore yolo mode

Uninstallers (.sh + .ps1) for Claude, Gemini, Codex, Qwen:
- Remove npm package / binary
- Remove settings directory (~/.gemini, ~/.qwen, ~/.codex, ~/.claude)
- Remove env vars from bashrc/zshrc, /etc/environment, /etc/profile.d
- Remove npm registry config

Also: restore defaultApprovalMode=yolo (npm package now includes
Target 9a patch in settingsSchema.js)

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

qwen/uqwen_uninstall.sh

@@ -0,0 +1,85 @@
+#!/usr/bin/env bash
+# Qwen Code — Uninstaller
+# Removes Qwen Code CLI, settings, env vars, and npm registry config.
+#
+# Usage: sudo bash uqwen_uninstall.sh
+set -euo pipefail
+
+GREEN="\033[92m"
+RED="\033[91m"
+CYAN="\033[96m"
+YELLOW="\033[93m"
+BOLD="\033[1m"
+RESET="\033[0m"
+
+log()  { echo -e "${GREEN}[+]${RESET} $*"; }
+warn() { echo -e "${YELLOW}[~]${RESET} $*"; }
+info() { echo -e "${CYAN}[i]${RESET} $*"; }
+
+echo -e "${BOLD}"
+echo "  +--------------------------------------+"
+echo "  |    Qwen Code — Uninstaller           |"
+echo "  +--------------------------------------+"
+echo -e "${RESET}"
+
+# ---- Uninstall npm package ----
+
+if npm list -g @qwen-code/qwen-code &>/dev/null 2>&1; then
+    info "Removing @qwen-code/qwen-code..."
+    npm uninstall -g @qwen-code/qwen-code 2>/dev/null || true
+    log "npm package removed"
+else
+    warn "Qwen Code not found in npm global packages"
+fi
+
+# ---- Remove settings ----
+
+for user_home in /root /home/*; do
+    QWEN_DIR="$user_home/.qwen"
+    if [ -d "$QWEN_DIR" ]; then
+        info "Removing $QWEN_DIR..."
+        rm -rf "$QWEN_DIR"
+        log "Removed $QWEN_DIR"
+    fi
+done
+
+# ---- Remove env vars from shell rc files ----
+
+for user_home in /root /home/*; do
+    for rc_file in "$user_home/.bashrc" "$user_home/.zshrc"; do
+        if [ -f "$rc_file" ] && grep -q 'QWEN_API_KEY\|QWEN_BASE_URL\|Qwen Code' "$rc_file" 2>/dev/null; then
+            info "Cleaning env vars from $rc_file..."
+            sed -i '/# Qwen Code/d' "$rc_file"
+            sed -i '/QWEN_API_KEY/d' "$rc_file"
+            sed -i '/QWEN_BASE_URL/d' "$rc_file"
+            log "Cleaned $rc_file"
+        fi
+    done
+done
+
+# ---- Remove /etc/profile.d script ----
+
+if [ -f "/etc/profile.d/qwen-code.sh" ]; then
+    info "Removing /etc/profile.d/qwen-code.sh..."
+    rm -f "/etc/profile.d/qwen-code.sh"
+    log "Removed /etc/profile.d/qwen-code.sh"
+fi
+
+# ---- Remove env vars from /etc/environment ----
+
+if [ -f "/etc/environment" ] && grep -q 'QWEN_API_KEY\|QWEN_BASE_URL' /etc/environment 2>/dev/null; then
+    info "Cleaning /etc/environment..."
+    sed -i '/QWEN_API_KEY/d' /etc/environment
+    sed -i '/QWEN_BASE_URL/d' /etc/environment
+    log "Cleaned /etc/environment"
+fi
+
+# ---- Remove npm registry config ----
+
+info "Removing npm registry config..."
+npm config delete @qwen-code:registry 2>/dev/null || true
+log "npm registry config removed"
+
+echo ""
+echo -e "${GREEN}${BOLD}  Qwen Code fully uninstalled!${RESET}"
+echo ""