feat: Add mobile responsive layout, open room access, and admin room management

Mobile Responsive Layout:
- Add useMediaQuery, useIsMobile, useIsTablet, useIsDesktop hooks for device detection
- Create MobileHeader component with hamburger menu and action drawer
- Create BottomToolbar for mobile navigation (Files, Members)
- Create SlidePanel component for full-screen mobile sidebars
- Update RoomDetail.tsx with mobile/desktop conditional rendering
- Update RoomList.tsx with single-column grid and touch-friendly buttons
- Add CSS custom properties for safe areas and touch targets (min 44px)
- Add mobile viewport meta tags for notched devices

Open Room Access:
- All authenticated users can view all rooms (not just their own)
- Users can join active rooms they're not members of
- Add is_member field to room responses
- Update room list API to return all rooms by default

Admin Room Management:
- Add permanent delete functionality for system admins
- Add delete confirmation dialog with room title verification
- Broadcast room deletion via WebSocket to connected users
- Add users search API for adding members

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

stop-dev.sh

@@ -168,6 +168,67 @@ else
     print_info "Keeping MinIO running (--keep-minio)"
 fi
 
+# ============================================================================
+# Port Release
+# ============================================================================
+print_header "Port Release"
+
+# Function to release port
+release_port() {
+    local port=$1
+    local service_name=$2
+
+    # Check if port is in use
+    if command -v fuser &> /dev/null; then
+        # Use fuser if available
+        if fuser "$port/tcp" > /dev/null 2>&1; then
+            print_info "Releasing port $port ($service_name)..."
+            fuser -k "$port/tcp" > /dev/null 2>&1 || true
+            sleep 1
+            if ! fuser "$port/tcp" > /dev/null 2>&1; then
+                print_ok "Port $port released"
+            else
+                print_warn "Port $port may still be in use (TIME_WAIT state)"
+            fi
+        else
+            print_ok "Port $port is free"
+        fi
+    elif command -v lsof &> /dev/null; then
+        # Fallback to lsof
+        local pid=$(lsof -ti ":$port" 2>/dev/null | head -1)
+        if [[ -n "$pid" ]]; then
+            print_info "Releasing port $port ($service_name, PID: $pid)..."
+            kill "$pid" 2>/dev/null || true
+            sleep 1
+            if ! lsof -ti ":$port" > /dev/null 2>&1; then
+                print_ok "Port $port released"
+            else
+                # Force kill if still in use
+                kill -9 "$pid" 2>/dev/null || true
+                sleep 1
+                if ! lsof -ti ":$port" > /dev/null 2>&1; then
+                    print_ok "Port $port force released"
+                else
+                    print_warn "Port $port may still be in use (TIME_WAIT state)"
+                fi
+            fi
+        else
+            print_ok "Port $port is free"
+        fi
+    else
+        # Check with netstat/ss as last resort
+        if ss -tuln 2>/dev/null | grep -q ":$port "; then
+            print_warn "Port $port appears in use but no tool to release it"
+        else
+            print_ok "Port $port is free"
+        fi
+    fi
+}
+
+# Release application ports (not MinIO ports - those are managed by Docker)
+release_port 8000 "Backend API"
+release_port 3000 "Frontend"
+
 # ============================================================================
 # Cleanup
 # ============================================================================