fix: Replace Codeberg dependency with local Forgejo instance (#611)

- Add setup_forge() to bin/disinto: provisions Forgejo via Docker,
  creates admin + bot users (dev-bot, review-bot), generates API
  tokens, creates repo, and pushes code — all automated
- Rename env vars: CODEBERG_TOKEN→FORGE_TOKEN, REVIEW_BOT_TOKEN→
  FORGE_REVIEW_TOKEN, CODEBERG_REPO→FORGE_REPO, CODEBERG_API→
  FORGE_API, CODEBERG_WEB→FORGE_WEB, CODEBERG_BOT_USERNAMES→
  FORGE_BOT_USERNAMES (with backwards-compat fallbacks)
- Rename API helpers: codeberg_api()→forge_api(), codeberg_api_all()
  →forge_api_all() (with compat aliases)
- Add forge_url field to project TOML; load-project.sh derives
  FORGE_API/FORGE_WEB from forge_url + repo
- Update parse_repo_slug() to accept any host URL, not just codeberg
- Forgejo data stored under ~/.disinto/forgejo/ (not in factory repo)
- Update all 58 files: agent scripts, formulas, docs, site HTML

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

AGENTS.md

@@ -4,7 +4,7 @@
 ## What this repo is
 
 Disinto is an autonomous code factory. It manages eight agents (dev, review,
-gardener, supervisor, planner, predictor, action, vault) that pick up issues from Codeberg,
+gardener, supervisor, planner, predictor, action, vault) that pick up issues from forge,
 implement them, review PRs, plan from the vision, gate dangerous actions, and
 keep the system healthy — all via cron and `claude -p`.
 
@@ -42,7 +42,7 @@ disinto/
 - **Shell**: bash (all agents are bash scripts)
 - **AI**: `claude -p` (one-shot) or `claude` (interactive/tmux sessions)
 - **CI**: Woodpecker CI (queried via REST API + Postgres)
-- **VCS**: Codeberg (git + Gitea REST API)
+- **VCS**: Forgejo (git + Gitea-compatible REST API)
 - **Notifications**: Matrix (optional)
 
 ## Coding conventions