docs: complete v0.5.0 administration, architecture and deployment guides

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# Changelog
## v0.4.0
All notable changes to this project will be documented in this file.
The format is based on Keep a Changelog and this project follows Semantic Versioning.
---
# v0.5.0 - General Availability (GA)
Release Date: 2026-06-19
BZOD v0.5.0 is the largest release since project inception, transforming BZOD from a single-user URL shortener into a complete multi-user redirector, landing page, analytics, and administration platform.
---
## Added
### Multi-User Platform
* Multi-user architecture with isolated tenant databases
* Standard user accounts
* Administrator accounts
* User provisioning and lifecycle management
* User enable/disable operations
* User deletion workflows
* Password reset functionality
* User quota management
* User database isolation
### Authentication & Security
* Session-based authentication
* CSRF protection
* Role-Based Access Control (RBAC)
* Password hashing and verification
* Session invalidation
* Login/logout workflows
* Administrative privilege separation
* Audit logging
### User Self-Service Portal
* User dashboard
* My Links management
* My Pages management
* User analytics dashboard
* API token management
* Password management
* Profile management
### Administration
* User management dashboard
* User detail pages
* User creation forms
* User editing interface
* Session administration
* Quota administration
* Moderation dashboard
* Slug management dashboard
* Audit event viewer
* Backup management interface
* System health dashboard
### Analytics
* Per-user analytics
* URL analytics dashboards
* Landing page analytics dashboards
* Browser statistics
* Referrer tracking
* Visit logging
* Geographic analytics framework
* Analytics aggregation jobs
### Content Management
* Landing page builder
* URL registry management
* Global slug namespace
* Slug ownership tracking
* Slug transfer workflows
* Soft delete support
* Moderation controls
### Operations
* Backup CLI
* Restore CLI
* User backup support
* User restore support
* Database diagnostics
* Health checks
* Quota reconciliation jobs
* Retention jobs
* Expiry jobs
* Aggregation workers
### Documentation
* Installation Guide
* Upgrade Guide
* Multi-User Guide
* Administration Guide
* Security Guide
* Backup & Restore Guide
* Database Documentation
* Architecture Documentation
* CLI Documentation
* API Documentation
* Testing Documentation
---
## Changed
### Architecture
* Migrated from single-user storage model to tenant-isolated storage model
* Introduced users.db as central identity store
* Introduced system.db as global platform metadata store
* Introduced per-user content databases
* Introduced per-user analytics databases
### Routing
* Unified global slug resolution
* Centralized slug ownership tracking
* Improved redirect handling
* Improved landing page routing
### Analytics
* Improved aggregation performance
* Improved reporting consistency
* Improved analytics isolation
### Administration
* Expanded administrative tooling
* Improved dashboard coverage
* Added operational visibility
---
## Security
### Added
* CSRF validation
* Session management
* RBAC enforcement
* Audit event logging
* User isolation controls
* Slug ownership validation
### Hardened
* Authentication flows
* Session validation
* Administrative authorization
* User lifecycle operations
---
## Database
### Added
* users.db
* system.db
* Per-user content.db
* Per-user analytics.db
* Migration framework
### Improved
* WAL mode support
* Upgrade migrations
* Backup compatibility
* Recovery workflows
---
## Testing
### Added
Comprehensive automated validation covering:
* Authentication tests
* Authorization tests
* Migration tests
* Upgrade validation tests
* User isolation tests
* Slug namespace tests
* Slug transfer tests
* Moderation tests
* Backup and restore tests
* Disaster recovery tests
* Analytics tests
* Concurrency tests
* HTTP end-to-end tests
* Business workflow tests
* Security regression tests
### Coverage
* 90+ unit and integration tests
* HTTP workflow validation
* Upgrade path verification
* Multi-user isolation verification
* Backup and recovery validation
---
## Fixed
### Authentication
* Multi-user migration login regressions
* Session validation issues
* Administrative account migration edge cases
### Routing
* Redirect handling consistency
* Slug ownership synchronization
* Landing page resolution issues
### Analytics
* Aggregation edge cases
* Reporting consistency
* Isolation validation
### Concurrency
* Fixed mutex deadlock conditions discovered during E2E testing
* Improved lock scoping around audit logging
### Administration
* Improved slug transfer workflows
* Improved user lifecycle operations
* Improved dashboard consistency
---
## Upgrade Notes
### From v0.4.0
BZOD v0.5.0 introduces a new multi-user architecture.
Existing installations are automatically migrated during startup.
Migration includes:
* Legacy administrator migration
* Global slug index generation
* User database creation
* Analytics preservation
* Content preservation
Backups are strongly recommended before upgrading.
---
# v0.4.0
## Added
* Raw visitor activity logs
* Analytics drill-down pages
* Date-range analytics filters
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* Advanced pagination
* Visitor log tables
### Improved
## Improved
* Registry pagination
* Analytics navigation
* Export performance
### Fixed
## Fixed
* Pagination edge cases
* Analytics sorting consistency
* Analytics sorting consistency