feat: add RgShows and IframeVideo streaming players

🎬 New Streaming Players Added:
- RgShows player for movies and TV shows via TMDB ID
- IframeVideo player using Kinopoisk ID and IMDB ID
- Unified players manager for multiple streaming providers
- JSON API endpoints for programmatic access

📡 RgShows Player Features:
- Direct movie streaming: /api/v1/players/rgshows/{tmdb_id}
- TV show episodes: /api/v1/players/rgshows/{tmdb_id}/{season}/{episode}
- HTTP API integration with rgshows.com
- 40-second timeout for reliability
- Proper error handling and logging

🎯 IframeVideo Player Features:
- Two-step authentication process (search + token extraction)
- Support for both Kinopoisk and IMDB IDs
- HTML iframe parsing for token extraction
- Multipart form data for video URL requests
- Endpoint: /api/v1/players/iframevideo/{kinopoisk_id}/{imdb_id}

🔧 Technical Implementation:
- Clean Go architecture with pkg/players package
- StreamResult interface for consistent responses
- Proper HTTP headers mimicking browser requests
- Comprehensive error handling and logging
- RESTful API design following existing patterns

🌐 New API Endpoints:
- /api/v1/players/rgshows/{tmdb_id} - RgShows movie player
- /api/v1/players/rgshows/{tmdb_id}/{season}/{episode} - RgShows TV player
- /api/v1/players/iframevideo/{kinopoisk_id}/{imdb_id} - IframeVideo player
- /api/v1/stream/{provider}/{tmdb_id} - JSON API for stream info

✅ Quality Assurance:
- All code passes go vet without issues
- Proper Go formatting applied
- Modular design for easy extension
- Built from commit 70febe5 'Merge branch feature/jwt-refresh-and-favorites-fix'

Ready for production deployment! 🚀

pkg/players/types.go

@@ -0,0 +1,99 @@
+package players
+
+// StreamResult represents the result of a streaming request
+type StreamResult struct {
+	Success   bool   `json:"success"`
+	StreamURL string `json:"stream_url,omitempty"`
+	Provider  string `json:"provider"`
+	Type      string `json:"type"` // "direct", "iframe", "hls", etc.
+	Error     string `json:"error,omitempty"`
+}
+
+// Player interface defines methods for streaming providers
+type Player interface {
+	GetMovieStream(tmdbID string) (*StreamResult, error)
+	GetTVStream(tmdbID string, season, episode int) (*StreamResult, error)
+}
+
+// PlayersManager manages all available streaming players
+type PlayersManager struct {
+	rgshows     *RgShowsPlayer
+	iframevideo *IframeVideoPlayer
+}
+
+// NewPlayersManager creates a new players manager
+func NewPlayersManager() *PlayersManager {
+	return &PlayersManager{
+		rgshows:     NewRgShowsPlayer(),
+		iframevideo: NewIframeVideoPlayer(),
+	}
+}
+
+// GetMovieStreams tries to get movie streams from all available providers
+func (pm *PlayersManager) GetMovieStreams(tmdbID string) []*StreamResult {
+	var results []*StreamResult
+
+	// Try RgShows
+	if stream, err := pm.rgshows.GetMovieStream(tmdbID); err == nil {
+		results = append(results, stream)
+	} else {
+		results = append(results, &StreamResult{
+			Success:  false,
+			Provider: "RgShows",
+			Error:    err.Error(),
+		})
+	}
+
+	return results
+}
+
+// GetTVStreams tries to get TV show streams from all available providers
+func (pm *PlayersManager) GetTVStreams(tmdbID string, season, episode int) []*StreamResult {
+	var results []*StreamResult
+
+	// Try RgShows
+	if stream, err := pm.rgshows.GetTVStream(tmdbID, season, episode); err == nil {
+		results = append(results, stream)
+	} else {
+		results = append(results, &StreamResult{
+			Success:  false,
+			Provider: "RgShows",
+			Error:    err.Error(),
+		})
+	}
+
+	return results
+}
+
+// GetMovieStreamByProvider gets movie stream from specific provider
+func (pm *PlayersManager) GetMovieStreamByProvider(provider, tmdbID string) (*StreamResult, error) {
+	switch provider {
+	case "rgshows":
+		return pm.rgshows.GetMovieStream(tmdbID)
+	default:
+		return &StreamResult{
+			Success:  false,
+			Provider: provider,
+			Error:    "provider not found",
+		}, nil
+	}
+}
+
+// GetTVStreamByProvider gets TV stream from specific provider
+func (pm *PlayersManager) GetTVStreamByProvider(provider, tmdbID string, season, episode int) (*StreamResult, error) {
+	switch provider {
+	case "rgshows":
+		return pm.rgshows.GetTVStream(tmdbID, season, episode)
+	default:
+		return &StreamResult{
+			Success:  false,
+			Provider: provider,
+			Error:    "provider not found",
+		}, nil
+	}
+}
+
+// GetStreamWithKinopoisk gets stream using Kinopoisk ID and IMDB ID (for IframeVideo)
+func (pm *PlayersManager) GetStreamWithKinopoisk(kinopoiskID, imdbID string) (*StreamResult, error) {
+	return pm.iframevideo.GetStream(kinopoiskID, imdbID)
+}