Add customer service component and enhance core functionality

[smirk9581]

• Fixed template parser crash when modifier events had no expression #43
• Fixed <slot> with v-else causing slot props parsing crash #44
• Fixed JSX children builder lacking tolerance for abnormal children shapes #45
• Fixed provide() using computed() internally not being converted to React output #46
• Fixed Vue type imports being removed after compilation but corresponding type references in code not being removed, causing TS type errors #47
• Fixed dependency analysis (e.g., watchEffect) missing optional chaining protection for object access mixed with optional chaining, causing crashes #48
• Fixed compiler generating incorrect runtime method dir.On when handling special template events, causing page crashes #49