feat(ecosystem): redesign disclaimer and fix submission flow

[kimo-ice]

Summary

• Disclaimer redesign — replaced the raw magenta text + hardcoded repo URL with a muted card, info icon, and two action buttons (Submit a project / Report an issue) built from content config, so copy and URLs can be edited without touching the component.
• Submission flow fix — both "Submit your project" CTAs (hero + disclaimer) now point to this repo's `add_project` issue template. Previously the hero linked to the old `taikoxyz/website-v3` repo.
• Issue template port — brought over `.github/ISSUE_TEMPLATE/add_project.yml` and `config.yml` from the old repo, and created the supporting labels (`area.website`, `category.ecosystem`, `category.enhancement`, `status.needs-triage`) on this repo using the taiko-mono color convention.
• Privacy hardening — the ported `add_project.yml` template previously required email and telegram in a public issue body. Added a prominent public-visibility warning, made those fields optional, and relaxed the name field to accept a GitHub/team handle.

Files

• `src/widgets/ecosystem-screens/ui/disclaimer/` — new structured widget (text + actions)
• `src/content/pages/ecosystem.ts`, `public/locales/en/ecosystem.json` — copy + URLs as data
• `src/content/types/index.ts` — `EcosystemPageData.disclaimer` shape updated
• `src/widgets/ecosystem-screens/ui/hero/index.tsx` — Submit CTA URL fixed
• `.github/ISSUE_TEMPLATE/add_project.yml`, `.github/ISSUE_TEMPLATE/config.yml` — ported + hardened

Test plan

• Run `pnpm dev`, navigate to `/ecosystem`, confirm the new disclaimer card renders correctly (desktop + mobile).
• Click "Submit a project" — confirm it opens the `add_project` issue form pre-filled on this repo, not the old one.
• Click "Report an issue" — confirm it opens a new blank issue on this repo.
• Click the hero "Submit your project" button — confirm it opens the same issue template.
• File a test submission with email/telegram blank — confirm the form validates and does not force PII.
• Verify labels `area.website`, `category.ecosystem`, `category.enhancement`, `status.needs-triage` all attach to the created issue.

[github-actions]

Preview: https://new-website-v3-hgb0b2ga9-taikoxyz.vercel.app