feat(app): add environment import/export and sidebar footer info

- add environment import/export API endpoints and client integration

- add environment export actions and toolbar import/export buttons in UI

- move theme switcher to sidebar bottom and show root package version

- switch snippet card menu icon to cog for consistent options affordance

server/src/environment/environment.controller.ts

@@ -14,6 +14,7 @@ import { ApiOperation, ApiResponse, ApiTags } from "@nestjs/swagger";
 import { EnvironmentService } from "./environment.service";
 import { CreateEnvironmentDto } from "./dto/create-environment.dto";
 import { UpdateEnvironmentDto } from "./dto/update-environment.dto";
+import { EnvironmentExportDto } from "./dto/environment-export.dto";
 import { PaginationQueryDto } from "../common/dto/pagination.dto";
 import { EnvironmentOrderBy } from "./environment.service";
 
@@ -30,6 +31,13 @@ export class EnvironmentController {
     return this.environmentService.create(dto);
   }
 
+  @Post("import")
+  @ApiOperation({ summary: "Import an environment (upsert by id or name)" })
+  @ApiResponse({ status: 201, description: "Environment imported" })
+  async importEnvironment(@Body() dto: EnvironmentExportDto) {
+    return this.environmentService.importEnvironment(dto);
+  }
+
   @Get()
   @ApiOperation({ summary: "List all environments (paginated)" })
   @ApiResponse({ status: 200, description: "Paginated environments" })
@@ -37,6 +45,15 @@ export class EnvironmentController {
     return this.environmentService.findAll(query);
   }
 
+  @Get(":id/export")
+  @ApiOperation({ summary: "Export an environment as a plain object" })
+  @ApiResponse({ status: 200, description: "Environment export payload" })
+  @ApiResponse({ status: 404, description: "Environment not found" })
+  async exportEnvironment(@Param("id", ParseUUIDPipe) id: string) {
+    const env = await this.environmentService.findOne(id);
+    return this.environmentService.exportEnvironment(env);
+  }
+
   @Get(":id")
   @ApiOperation({ summary: "Get environment by ID" })
   @ApiResponse({ status: 200, description: "Environment record" })