The raw reqwest client hive-forge uses for Forgejo's web-router-only
routes (attachment downloads, Actions artifact/log routes) had no
timeout, so a hung Forgejo response blocked the calling CLI invocation
indefinitely.
Adds a 5s connect_timeout (matching #4737's outbound-HTTP sites) plus
a per-call request timeout: 15s (config_pr_poll's forge budget) for
the small JSON calls (get_api_json, post_json_web), and 10 minutes for
get_bytes_named/get_bytes_raw, which download attachments, Actions
artifact zips and persisted job logs that can be large.
reqwest::blocking has no separate read/idle timeout, so a single
whole-request budget has to cover those downloads; the smaller JSON
budget would cut them off partway through.
Refs #4746, #4737
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