Major improvements: Fix download limits, enhance license display, fix software filenames

🔧 Bug Fixes:
- Fixed download limits defaulting to 5 instead of 0 for unlimited downloads
- Fixed software license filename sanitization (spaces→dashes, dots→underscores, proper .zip extension)
- Software downloads now show as "Test-Plugin-v2-2-0.zip" instead of "Test Plugin v2.2.0"

✨ UI/UX Enhancements:
- Redesigned license key display to span full table width with FontAwesome copy icons
- Added responsive CSS styling for license key rows
- Integrated FontAwesome CDN for modern copy icons

🏗️ Architecture Improvements:
- Added comprehensive filename sanitization in both download handler and API paths
- Enhanced software license product handling for local package files
- Improved error handling and logging throughout download processes

📦 Infrastructure:
- Added Gitea workflows for automated releases on push to main
- Created comprehensive .gitignore excluding test files and browser automation
- Updated documentation with all recent improvements and technical insights

🔍 Technical Details:
- Software license products served from wp-content/uploads/wpdd-packages/
- Download flow: token → process_download_by_token() → process_download() → deliver_file()
- Dual path coverage for both API downloads and regular file delivery
- Version placeholder system for automated deployment

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

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

admin/wpdd-db-migrate.php

@@ -0,0 +1,54 @@
+<?php
+/**
+ * Database migration script for WP Digital Download
+ * Adds missing columns and updates database schema
+ */
+
+if (!defined('ABSPATH')) {
+    exit;
+}
+
+function wpdd_migrate_database() {
+    global $wpdb;
+    
+    // Check if available_at column exists in wpdd_creator_earnings table
+    $column_exists = $wpdb->get_results(
+        "SHOW COLUMNS FROM {$wpdb->prefix}wpdd_creator_earnings LIKE 'available_at'"
+    );
+    
+    if (empty($column_exists)) {
+        // Add the missing available_at column
+        $result = $wpdb->query(
+            "ALTER TABLE {$wpdb->prefix}wpdd_creator_earnings 
+             ADD COLUMN available_at datetime DEFAULT NULL AFTER payout_status,
+             ADD INDEX available_at (available_at)"
+        );
+        
+        if ($result !== false) {
+            error_log('WPDD Migration: Successfully added available_at column to wpdd_creator_earnings table');
+            
+            // Update existing pending earnings to have an available_at date
+            $holding_days = intval(get_option('wpdd_earnings_holding_days', 15));
+            $wpdb->query(
+                $wpdb->prepare(
+                    "UPDATE {$wpdb->prefix}wpdd_creator_earnings 
+                     SET available_at = DATE_ADD(created_at, INTERVAL %d DAY)
+                     WHERE payout_status = 'pending' AND available_at IS NULL",
+                    $holding_days
+                )
+            );
+            
+            return true;
+        } else {
+            error_log('WPDD Migration Error: Failed to add available_at column - ' . $wpdb->last_error);
+            return false;
+        }
+    }
+    
+    return true; // Column already exists
+}
+
+// Run migration if accessed directly (for manual execution)
+if (basename($_SERVER['SCRIPT_FILENAME']) === 'wpdd-db-migrate.php') {
+    wpdd_migrate_database();
+}