Add short video configuration and related API endpoints

- Updated .env.example to include SHORT_VIDEO_API_KEY, SHORT_VIDEO_FREE_QUOTA, and SHORT_VIDEO_TIMEOUT_SECONDS.
- Enhanced main.go to auto-migrate new VideoParseLog and VideoParseUnlock models.
- Introduced VideoService and VideoHandler for handling video-related operations.
- Added protected API routes for removing watermarks and unlocking video features.
- Updated config.go to support short video configuration settings.
- Expanded documentation to reflect new features and configuration options.

docs/sql/remove_watermark.sql

@@ -0,0 +1,33 @@
+-- 短视频去水印调用日志
+CREATE TABLE IF NOT EXISTS `video_parse_logs` (
+  `id` bigint unsigned NOT NULL AUTO_INCREMENT,
+  `created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  `updated_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  `deleted_at` datetime DEFAULT NULL,
+  `mini_program_id` bigint unsigned NOT NULL,
+  `user_id` bigint unsigned NOT NULL,
+  `request_content` text,
+  `parsed_url` varchar(500) DEFAULT NULL,
+  `third_party_status` int DEFAULT NULL,
+  `third_party_payload` json DEFAULT NULL,
+  `free_quota_used` tinyint(1) NOT NULL DEFAULT '1',
+  `duration_ms` int DEFAULT NULL,
+  `error_message` varchar(500) DEFAULT NULL,
+  PRIMARY KEY (`id`),
+  KEY `idx_video_parse_user_date` (`mini_program_id`,`user_id`,`created_at`),
+  KEY `idx_video_parse_free` (`mini_program_id`,`user_id`,`free_quota_used`,`created_at`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- 每日广告解锁记录
+CREATE TABLE IF NOT EXISTS `video_parse_unlocks` (
+  `id` bigint unsigned NOT NULL AUTO_INCREMENT,
+  `created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  `updated_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  `deleted_at` datetime DEFAULT NULL,
+  `mini_program_id` bigint unsigned NOT NULL,
+  `user_id` bigint unsigned NOT NULL,
+  `unlock_date` date NOT NULL,
+  `ad_watched_at` datetime NOT NULL,
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `uniq_video_unlock_date` (`mini_program_id`,`user_id`,`unlock_date`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;