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/activity/dto/create-activity-log.dto.ts

@@ -0,0 +1,43 @@
+import { ActivityAction, EntityType } from "@prisma/client";
+import {
+  IsUUID,
+  IsEnum,
+  IsOptional,
+  IsObject,
+  IsString,
+  MaxLength,
+} from "class-validator";
+
+/**
+ * DTO for creating a new activity log entry
+ */
+export class CreateActivityLogDto {
+  @IsUUID("4", { message: "workspaceId must be a valid UUID" })
+  workspaceId!: string;
+
+  @IsUUID("4", { message: "userId must be a valid UUID" })
+  userId!: string;
+
+  @IsEnum(ActivityAction, { message: "action must be a valid ActivityAction" })
+  action!: ActivityAction;
+
+  @IsEnum(EntityType, { message: "entityType must be a valid EntityType" })
+  entityType!: EntityType;
+
+  @IsUUID("4", { message: "entityId must be a valid UUID" })
+  entityId!: string;
+
+  @IsOptional()
+  @IsObject({ message: "details must be an object" })
+  details?: Record<string, unknown>;
+
+  @IsOptional()
+  @IsString({ message: "ipAddress must be a string" })
+  @MaxLength(45, { message: "ipAddress must not exceed 45 characters" })
+  ipAddress?: string;
+
+  @IsOptional()
+  @IsString({ message: "userAgent must be a string" })
+  @MaxLength(500, { message: "userAgent must not exceed 500 characters" })
+  userAgent?: string;
+}