chore(repo): restructure as monorepo with server and client workspaces

- move NestJS app into server/ subdirectory
- add client/ React+TypeScript (Vite) app with Hello World
- update docker-compose to build and run both services
- add root package.json declaring npm workspaces
- update .gitignore to cover node_modules and dist at all depths

server/src/session/session.controller.ts

@@ -0,0 +1,37 @@
+import {
+  Controller,
+  Delete,
+  Get,
+  Param,
+  ParseIntPipe,
+  Query,
+} from "@nestjs/common";
+import { ApiOperation, ApiResponse, ApiTags } from "@nestjs/swagger";
+import { SessionService } from "./session.service";
+import { SessionContextService } from "./session-context.service";
+import { PaginationQueryDto } from "../common/dto/pagination.dto";
+import { SessionOrderBy } from "./session.service";
+
+@ApiTags("sessions")
+@Controller("sessions")
+export class SessionController {
+  constructor(
+    private readonly sessionService: SessionService,
+    private readonly sessionContextService: SessionContextService,
+  ) {}
+
+  @Get()
+  @ApiOperation({ summary: "List all stored sessions (paginated)" })
+  @ApiResponse({ status: 200, description: "Paginated sessions" })
+  findAll(@Query() query: PaginationQueryDto<SessionOrderBy>) {
+    return this.sessionService.findAll(query);
+  }
+
+  @Delete(":id")
+  @ApiOperation({ summary: "Delete a session by ID (closes it first if open)" })
+  @ApiResponse({ status: 200, description: "Session deleted" })
+  @ApiResponse({ status: 404, description: "Session not found" })
+  async remove(@Param("id", ParseIntPipe) id: number): Promise<void> {
+    await this.sessionContextService.delete(id);
+  }
+}