feat: add Kokoro TTS, ranking page, direct HTTP strategy, and chapter-number fix

- Add Kokoro-FastAPI TTS integration to the chapter reader UI:
  - Browser-side MSE streaming with paragraph-level click-to-start
  - Voice selector, speed slider, auto-next with prefetch of the next chapter
  - New GET /ui/chapter-text endpoint that strips Markdown and serves plain text

- Add ranking page (novelfire /ranking scraper, WriteRanking/ReadRankingItems
  in writer, GET /ranking + POST /ranking/refresh + GET /ranking/view routes)
  with local-library annotation and one-click scrape buttons

- Add StrategyDirect (plain HTTP client) as a new browser strategy; the
  default strategy is now 'direct' for chapter fetching and 'content'
  for chapter-list URL retrieval (split via BROWSERLESS_URL_STRATEGY)

- Fix chapter numbering bug: numbers are now derived from the URL path
  (/chapter-N) rather than list position, correcting newest-first ordering

- Add 'refresh <slug>' CLI sub-command to re-scrape a book from its saved
  source_url without knowing the original URL

- Extend NovelScraper interface with RankingProvider (ScrapeRanking)

- Tune scraper timeouts: wait-for-selector reduced to 5 s, GotoOptions
  timeout set to 60 s, content/scrape client defaults raised to 90 s

- Add cover extraction fix (figure.cover > img rather than bare img.cover)

- Add AGENTS.md and .aiignore for AI tooling context

- Add integration tests for browser client and novelfire scraper (build
  tag: integration) and unit tests for chapterNumberFromURL and pagination

scraper/internal/browser/http.go

@@ -0,0 +1,68 @@
+package browser
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+)
+
+type httpClient struct {
+	cfg  Config
+	http *http.Client
+	sem  chan struct{}
+}
+
+func NewDirectHTTPClient(cfg Config) BrowserClient {
+	if cfg.Timeout == 0 {
+		cfg.Timeout = 30 * time.Second
+	}
+	return &httpClient{
+		cfg:  cfg,
+		http: &http.Client{Timeout: cfg.Timeout},
+		sem:  makeSem(cfg.MaxConcurrent),
+	}
+}
+
+func (c *httpClient) Strategy() Strategy { return StrategyDirect }
+
+func (c *httpClient) GetContent(ctx context.Context, req ContentRequest) (string, error) {
+	if err := acquire(ctx, c.sem); err != nil {
+		return "", fmt.Errorf("http: semaphore: %w", err)
+	}
+	defer release(c.sem)
+
+	httpReq, err := http.NewRequestWithContext(ctx, http.MethodGet, req.URL, nil)
+	if err != nil {
+		return "", fmt.Errorf("http: build request: %w", err)
+	}
+	httpReq.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36")
+	httpReq.Header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
+	httpReq.Header.Set("Accept-Language", "en-US,en;q=0.5")
+
+	resp, err := c.http.Do(httpReq)
+	if err != nil {
+		return "", fmt.Errorf("http: do request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		b, _ := io.ReadAll(resp.Body)
+		return "", fmt.Errorf("http: unexpected status %d: %s", resp.StatusCode, b)
+	}
+
+	raw, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("http: read body: %w", err)
+	}
+	return string(raw), nil
+}
+
+func (c *httpClient) ScrapePage(_ context.Context, _ ScrapeRequest) (ScrapeResponse, error) {
+	return ScrapeResponse{}, fmt.Errorf("http client does not support ScrapePage; use browserless")
+}
+
+func (c *httpClient) CDPSession(_ context.Context, _ string, _ CDPSessionFunc) error {
+	return fmt.Errorf("http client does not support CDP; use browserless")
+}