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/interfaces/activity.interface.ts

@@ -0,0 +1,57 @@
+import { ActivityAction, EntityType, Prisma } from "@prisma/client";
+
+/**
+ * Interface for creating a new activity log entry
+ */
+export interface CreateActivityLogInput {
+  workspaceId: string;
+  userId: string;
+  action: ActivityAction;
+  entityType: EntityType;
+  entityId: string;
+  details?: Record<string, any>;
+  ipAddress?: string;
+  userAgent?: string;
+}
+
+/**
+ * Interface for activity log query filters
+ */
+export interface ActivityLogFilters {
+  workspaceId: string;
+  userId?: string;
+  action?: ActivityAction;
+  entityType?: EntityType;
+  entityId?: string;
+  startDate?: Date;
+  endDate?: Date;
+}
+
+/**
+ * Type for activity log result with user info
+ * Uses Prisma's generated type for type safety
+ */
+export type ActivityLogResult = Prisma.ActivityLogGetPayload<{
+  include: {
+    user: {
+      select: {
+        id: true;
+        name: true;
+        email: true;
+      };
+    };
+  };
+}>;
+
+/**
+ * Interface for paginated activity log results
+ */
+export interface PaginatedActivityLogs {
+  data: ActivityLogResult[];
+  meta: {
+    total: number;
+    page: number;
+    limit: number;
+    totalPages: number;
+  };
+}