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

docs/1-getting-started/3-configuration/1-environment.md

@@ -23,9 +23,20 @@ nano .env
 DATABASE_URL=postgresql://user:password@host:port/database
 
 # Examples:
-# Local: postgresql://mosaic:mosaic@localhost:5432/mosaic
-# Docker: postgresql://mosaic:mosaic@postgres:5432/mosaic
+# Local: postgresql://mosaic:mosaic_dev_password@localhost:5432/mosaic
+# Docker: postgresql://mosaic:mosaic_dev_password@postgres:5432/mosaic
 # Production: postgresql://user:pass@prod-host:5432/mosaic
+
+# Docker-specific variables
+POSTGRES_USER=mosaic
+POSTGRES_PASSWORD=mosaic_dev_password
+POSTGRES_DB=mosaic
+POSTGRES_PORT=5432
+
+# PostgreSQL Performance Tuning (Optional)
+POSTGRES_SHARED_BUFFERS=256MB
+POSTGRES_EFFECTIVE_CACHE_SIZE=1GB
+POSTGRES_MAX_CONNECTIONS=100
 ```
 
 **Format:** `postgresql://[user[:password]@][host][:port][/database][?options]`
@@ -85,17 +96,21 @@ See [Authentik Setup](2-authentik.md) for complete OIDC configuration.
 
 ## Cache and Storage
 
-### Redis/Valkey
+### Valkey (Redis-compatible)
 
 ```bash
-# Redis connection string
-REDIS_URL=redis://localhost:6379
+# Valkey connection string
+VALKEY_URL=redis://localhost:6379
 
 # With password
-REDIS_URL=redis://:password@localhost:6379
+VALKEY_URL=redis://:password@localhost:6379
 
-# Docker
-REDIS_URL=redis://valkey:6379
+# Docker internal networking
+VALKEY_URL=redis://valkey:6379
+
+# Docker-specific variables
+VALKEY_PORT=6379
+VALKEY_MAXMEMORY=256mb
 ```
 
 ### File Storage (Future)