feat(#37-41): Add domains, ideas, relationships, agents, widgets schema

Schema additions for issues #37-41:

New models:
- Domain (#37): Life domains (work, marriage, homelab, etc.)
- Idea (#38): Brain dumps with pgvector embeddings
- Relationship (#39): Generic entity linking (blocks, depends_on)
- Agent (#40): ClawdBot agent tracking with metrics
- AgentSession (#40): Conversation session tracking
- WidgetDefinition (#41): HUD widget registry
- UserLayout (#41): Per-user dashboard configuration

Updated models:
- Task, Event, Project: Added domainId foreign key
- User, Workspace: Added new relations

New enums:
- IdeaStatus: CAPTURED, PROCESSING, ACTIONABLE, ARCHIVED, DISCARDED
- RelationshipType: BLOCKS, BLOCKED_BY, DEPENDS_ON, etc.
- AgentStatus: IDLE, WORKING, WAITING, ERROR, TERMINATED
- EntityType: Added IDEA, DOMAIN

Migration: 20260129182803_add_domains_ideas_agents_widgets

apps/api/src/main.ts

@@ -1,4 +1,5 @@
 import { NestFactory } from "@nestjs/core";
+import { ValidationPipe } from "@nestjs/common";
 import { AppModule } from "./app.module";
 import { GlobalExceptionFilter } from "./filters/global-exception.filter";
 
@@ -27,6 +28,18 @@ function getPort(): number {
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
 
+  // Enable global validation pipe with transformation
+  app.useGlobalPipes(
+    new ValidationPipe({
+      transform: true,
+      whitelist: true,
+      forbidNonWhitelisted: false,
+      transformOptions: {
+        enableImplicitConversion: false,
+      },
+    })
+  );
+
   app.useGlobalFilters(new GlobalExceptionFilter());
   app.enableCors();