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.

internal/model/video_parse.go

@@ -0,0 +1,44 @@
+package model
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type VideoParseLog struct {
+	ID        uint           `gorm:"primarykey" json:"id"`
+	CreatedAt time.Time      `json:"created_at"`
+	UpdatedAt time.Time      `json:"updated_at"`
+	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`
+
+	MiniProgramID     uint   `gorm:"index:idx_video_parse_user_date,priority:1" json:"mini_program_id"`
+	UserID            uint   `gorm:"index:idx_video_parse_user_date,priority:2" json:"user_id"`
+	RequestContent    string `gorm:"type:text" json:"request_content"`
+	ParsedURL         string `gorm:"size:500" json:"parsed_url"`
+	ThirdPartyStatus  int    `json:"third_party_status"`
+	ThirdPartyPayload []byte `gorm:"type:json" json:"third_party_payload"`
+	FreeQuotaUsed     bool   `gorm:"default:1" json:"free_quota_used"`
+	DurationMs        int    `json:"duration_ms"`
+	ErrorMessage      string `gorm:"size:500" json:"error_message"`
+}
+
+func (VideoParseLog) TableName() string {
+	return "video_parse_logs"
+}
+
+type VideoParseUnlock struct {
+	ID        uint           `gorm:"primarykey" json:"id"`
+	CreatedAt time.Time      `json:"created_at"`
+	UpdatedAt time.Time      `json:"updated_at"`
+	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`
+
+	MiniProgramID uint      `gorm:"index:idx_video_unlock_user_date,priority:1" json:"mini_program_id"`
+	UserID        uint      `gorm:"index:idx_video_unlock_user_date,priority:2" json:"user_id"`
+	UnlockDate    time.Time `gorm:"type:date;index:idx_video_unlock_user_date,priority:3" json:"unlock_date"`
+	AdWatchedAt   time.Time `json:"ad_watched_at"`
+}
+
+func (VideoParseUnlock) TableName() string {
+	return "video_parse_unlocks"
+}