feat(v1.5.2): Execute database migrations and complete setup

- Execute all 6 migrations on Desk CRM production database
- Create missing tables: cr_lsps, cr_agent_lsps, cr_lsp_usage
- Create archive tables: cr_*_usage_archive (4 tables)
- Create system tables: cr_migrations, cr_maintenance_log
- Make all scripts executable (chmod +x)
- Total cr_* tables: 38

Migration files:
- 001_initial_schema.sql
- 002_add_lsps.sql
- 003_add_relationships.sql
- 004_add_telemetry.sql
- 005_add_archive_tables.sql
- 006_add_maintenance_log.sql

Scripts:
- session-init.sh, session-end.sh
- inject-context.sh, inject-agent-context.sh
- record-usage.sh, db-backup.sh, sync-to-mysql.sh

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

migrations/006_add_maintenance_log.sql

@@ -0,0 +1,39 @@
+-- Migration: 006_add_maintenance_log
+-- Author: Descomplicar®
+-- Date: 2026-02-04
+-- Description: Tabelas de controlo de migrations e log de manutenção
+
+-- UP
+
+-- Controlo de migrations
+CREATE TABLE IF NOT EXISTS cr_migrations (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    migration_name VARCHAR(100) NOT NULL UNIQUE,
+    applied_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    checksum VARCHAR(64),
+    status ENUM('applied', 'rolled_back', 'failed') DEFAULT 'applied',
+    execution_time_ms INT DEFAULT 0
+);
+
+-- Log de operações de manutenção
+CREATE TABLE IF NOT EXISTS cr_maintenance_log (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    operation VARCHAR(50) NOT NULL,
+    table_name VARCHAR(100),
+    rows_affected INT DEFAULT 0,
+    details JSON,
+    executed_by VARCHAR(100) DEFAULT 'system',
+    executed_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    status ENUM('success', 'failed', 'rolled_back') DEFAULT 'success',
+    error_message TEXT
+);
+
+-- Índices
+CREATE INDEX idx_migrations_status ON cr_migrations(status);
+CREATE INDEX idx_maintenance_operation ON cr_maintenance_log(operation);
+CREATE INDEX idx_maintenance_date ON cr_maintenance_log(executed_at);
+CREATE INDEX idx_maintenance_status ON cr_maintenance_log(status);
+
+-- DOWN
+DROP TABLE IF EXISTS cr_maintenance_log;
+DROP TABLE IF EXISTS cr_migrations;