fix: address review findings (pagination, case-insensitive bool, docs)

- ListReviews: add ?limit=50 to handle PRs with many reviews
- envOrDefaultBool: case-insensitive, whitespace-trimmed (TRUE/Yes/1 all work)
- action.yml: document accepted boolean values in description
- Test: verify limit query parameter is sent

gitea/client.go

@@ -298,7 +298,7 @@ func (c *Client) GetAuthenticatedUser(ctx context.Context) (string, error) {
 
 // ListReviews returns all reviews on a pull request.
 func (c *Client) ListReviews(ctx context.Context, owner, repo string, number int) ([]Review, error) {
-	reqURL := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d/reviews",
+	reqURL := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d/reviews?limit=50",
 		c.baseURL,
 		url.PathEscape(owner),
 		url.PathEscape(repo),