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/package.json

@@ -33,6 +33,8 @@
     "@nestjs/platform-express": "^11.1.12",
     "@prisma/client": "^6.19.2",
     "better-auth": "^1.4.17",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.14.3",
     "reflect-metadata": "^0.2.2",
     "rxjs": "^7.8.1"
   },
@@ -45,11 +47,12 @@
     "@swc/core": "^1.10.18",
     "@types/express": "^5.0.1",
     "@types/node": "^22.13.4",
+    "@vitest/coverage-v8": "^4.0.18",
     "express": "^5.2.1",
     "prisma": "^6.19.2",
     "tsx": "^4.21.0",
     "typescript": "^5.8.2",
     "unplugin-swc": "^1.5.2",
-    "vitest": "^3.0.8"
+    "vitest": "^4.0.18"
   }
 }