Tasks Module Stage 3: Attachments

- Add migration for task_attachments table
- Create TaskAttachmentModel with file handling methods
- Add TaskService methods for upload/delete attachments
- Add API routes for attachments (upload, delete, download)
- Add controller methods for attachment operations
- Add UI section in task view with file upload form
- Add JavaScript handlers for AJAX file operations

app/Database/Migrations/2026-02-08-120006_CreateTaskAttachmentsTable.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace App\Database\Migrations;
+
+use CodeIgniter\Database\Migration;
+
+class CreateTaskAttachmentsTable extends Migration
+{
+    public function up()
+    {
+        $this->forge->addField([
+            'id' => [
+                'type'           => 'INT',
+                'constraint'     => 11,
+                'unsigned'       => true,
+                'auto_increment' => true,
+            ],
+            'task_id' => [
+                'type'       => 'INT',
+                'constraint' => 11,
+                'unsigned'   => true,
+                'null'       => false,
+            ],
+            'file_name' => [
+                'type'       => 'VARCHAR',
+                'constraint' => 255,
+                'null'       => false,
+            ],
+            'file_path' => [
+                'type'       => 'VARCHAR',
+                'constraint' => 500,
+                'null'       => false,
+            ],
+            'file_size' => [
+                'type'       => 'INT',
+                'constraint' => 11,
+                'default'    => 0,
+            ],
+            'file_type' => [
+                'type'       => 'VARCHAR',
+                'constraint' => 100,
+                'default'    => '',
+            ],
+            'uploaded_by' => [
+                'type'       => 'INT',
+                'constraint' => 11,
+                'null'       => false,
+            ],
+            'created_at' => [
+                'type' => 'DATETIME',
+                'null' => true,
+            ],
+            'updated_at' => [
+                'type' => 'DATETIME',
+                'null' => true,
+            ],
+        ]);
+        
+        $this->forge->addKey('id', true);
+        $this->forge->addKey('task_id');
+        $this->forge->addForeignKey('task_id', 'tasks', 'id', '', 'CASCADE');
+        
+        $this->forge->createTable('task_attachments');
+    }
+
+    public function down()
+    {
+        $this->forge->dropTable('task_attachments');
+    }
+}