Add Activity Timeline feature and database migrations

- Add Activity Timeline tab to ticket view showing chronological history
- Create getTicketTimeline() method in AuditLogModel
- Update TicketController to load timeline data
- Add timeline UI with helper functions for formatting events
- Add comprehensive timeline CSS with dark mode support
- Create migrations 007-010 for upcoming features:
  - 007: Ticket assignment functionality
  - 008: Status workflow transitions
  - 009: Ticket templates
  - 010: Bulk operations tracking

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

migrations/009_add_ticket_templates.sql

@@ -0,0 +1,24 @@
+-- Migration 009: Add ticket templates
+-- Creates ticket_templates table for reusable ticket templates
+
+CREATE TABLE ticket_templates (
+    template_id INT AUTO_INCREMENT PRIMARY KEY,
+    template_name VARCHAR(100) NOT NULL,
+    title_template VARCHAR(255) NOT NULL,
+    description_template TEXT NOT NULL,
+    category VARCHAR(50),
+    type VARCHAR(50),
+    default_priority INT DEFAULT 4,
+    created_by INT,
+    is_active BOOLEAN DEFAULT TRUE,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (created_by) REFERENCES users(user_id),
+    INDEX idx_template_name (template_name)
+);
+
+-- Insert default templates
+INSERT INTO ticket_templates (template_name, title_template, description_template, category, type, default_priority) VALUES
+('Hardware Failure', 'Hardware Failure: [Device Name]', 'Device: \nIssue: \nError Messages: \nTroubleshooting Done: ', 'Hardware', 'Problem', 2),
+('Software Installation', 'Install [Software Name]', 'Software: \nVersion: \nLicense Key: \nInstallation Path: ', 'Software', 'Install', 3),
+('Network Issue', 'Network Issue: [Brief Description]', 'Affected System: \nSymptoms: \nIP Address: \nConnectivity Tests: ', 'Hardware', 'Problem', 2),
+('Maintenance Request', 'Scheduled Maintenance: [System Name]', 'System: \nMaintenance Type: \nScheduled Date: \nDowntime Expected: ', 'Hardware', 'Maintenance', 4);