feat(anime): add episode api support

internal/jikan/episodes.go

@@ -0,0 +1,35 @@
+package jikan
+
+import (
+	"context"
+	"fmt"
+	"time"
+)
+
+func (c *Client) GetEpisodes(ctx context.Context, animeID int, page int) (EpisodesResponse, error) {
+	if page < 1 {
+		page = 1
+	}
+
+	cacheKey := fmt.Sprintf("anime:%d:episodes:%d", animeID, page)
+	var cached EpisodesResponse
+	if c.getCache(ctx, cacheKey, &cached) {
+		return cached, nil
+	}
+
+	var stale EpisodesResponse
+	hasStale := c.getStaleCache(ctx, cacheKey, &stale)
+
+	var result EpisodesResponse
+	reqURL := fmt.Sprintf("%s/anime/%d/episodes?page=%d", c.baseURL, animeID, page)
+	if err := c.fetchWithRetry(ctx, reqURL, &result); err != nil {
+		if hasStale {
+			return stale, nil
+		}
+
+		return EpisodesResponse{}, err
+	}
+
+	c.setCache(ctx, cacheKey, result, 12*time.Hour)
+	return result, nil
+}