Improve installer logic and add structured logging

Refactored InstallerController to use a Logger for structured install/update logs and improved migration detection logic to avoid partial table creation on fresh installs. Enhanced migration execution robustness, clarified handling of consolidated schema, and improved error handling and admin notification. Moved user_notifications table creation in the initial schema to follow domains table for correct foreign key references.

database/migrations/000_initial_schema_v1.1.0.sql

@@ -113,25 +113,6 @@ CREATE TABLE IF NOT EXISTS two_factor_email_codes (
     INDEX idx_used (used)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
--- User notifications table (in-app notifications)
-CREATE TABLE IF NOT EXISTS user_notifications (
-    id INT AUTO_INCREMENT PRIMARY KEY,
-    user_id INT NOT NULL,
-    type VARCHAR(50) NOT NULL,
-    title VARCHAR(255) NOT NULL,
-    message TEXT NOT NULL,
-    domain_id INT NULL,
-    is_read BOOLEAN DEFAULT FALSE,
-    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
-    read_at TIMESTAMP NULL,
-    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
-    FOREIGN KEY (domain_id) REFERENCES domains(id) ON DELETE SET NULL,
-    INDEX idx_user_id (user_id),
-    INDEX idx_is_read (is_read),
-    INDEX idx_created_at (created_at),
-    INDEX idx_type (type)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
-
 -- =====================================================
 -- CORE TABLES
 -- =====================================================
@@ -178,6 +159,25 @@ CREATE TABLE IF NOT EXISTS domains (
     INDEX idx_domains_user_id (user_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
+-- User notifications table (in-app notifications)
+CREATE TABLE IF NOT EXISTS user_notifications (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    user_id INT NOT NULL,
+    type VARCHAR(50) NOT NULL,
+    title VARCHAR(255) NOT NULL,
+    message TEXT NOT NULL,
+    domain_id INT NULL,
+    is_read BOOLEAN DEFAULT FALSE,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    read_at TIMESTAMP NULL,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
+    FOREIGN KEY (domain_id) REFERENCES domains(id) ON DELETE SET NULL,
+    INDEX idx_user_id (user_id),
+    INDEX idx_is_read (is_read),
+    INDEX idx_created_at (created_at),
+    INDEX idx_type (type)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
 -- Notification channels table
 CREATE TABLE IF NOT EXISTS notification_channels (
     id INT AUTO_INCREMENT PRIMARY KEY,