#6501: Chore/openclaw issue templates

<!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> Updates GitHub issue templates to reflect the OpenClaw naming and to collect more actionable info: the bug template now asks for OpenClaw version/commit plus an optional messaging channel, and the feature request template adds motivation/context, scope, and a more detailed proposed-solution prompt. The issue template config also updates Discord contact-link descriptions to remove Clawdbot/Krill references. <h3>Confidence Score: 4/5</h3> - This PR is safe to merge; changes are limited to issue-template text with minor UX nits. - Only GitHub issue template markdown/YAML is modified. No runtime code changes; the only actionable issues are template UX/clarity (empty checkboxes and redundant contact links). - No files require special attention <!-- greptile_other_comments_section --> <!-- /greptile_comment -->