feat: complete Epic 0 — foundation migration & infrastructure setup

Stories 0.2-0.5: rename folders→declarations (backend+frontend), configure
Redis for cache/queue/sessions, add foundation database migrations
(permissions, archived_at), replace DeclarationStatus enum with architecture
lifecycle values, create DeclarationObserver for status transition validation
and auto-archive, fix controller status transitions to respect observer rules.

93 tests pass (240 assertions).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.env.example

@@ -27,7 +27,7 @@ DB_CONNECTION=sqlite
 # DB_USERNAME=root
 # DB_PASSWORD=
 
-SESSION_DRIVER=database
+SESSION_DRIVER=redis
 SESSION_LIFETIME=120
 SESSION_ENCRYPT=false
 SESSION_PATH=/
@@ -35,15 +35,15 @@ SESSION_DOMAIN=null
 
 BROADCAST_CONNECTION=log
 FILESYSTEM_DISK=local
-QUEUE_CONNECTION=database
+QUEUE_CONNECTION=redis
 
-CACHE_STORE=databasew
+CACHE_STORE=redis
 # CACHE_PREFIX=
 
 MEMCACHED_HOST=127.0.0.1
 
 REDIS_CLIENT=phpredis
-REDIS_HOST=127.0.0.1
+REDIS_HOST=redis
 REDIS_PASSWORD=null
 REDIS_PORT=6379