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>

.woodpecker/agent-smoke.sh

@@ -92,7 +92,7 @@ echo "=== 2/2  Function resolution ==="
 # Functions provided by shared lib files (available to all agent scripts via source).
 #
 # Included — these are inline-sourced by agent scripts:
-#   lib/env.sh              — sourced by every agent (log, codeberg_api, etc.)
+#   lib/env.sh              — sourced by every agent (log, forge_api, etc.)
 #   lib/agent-session.sh    — sourced by orchestrators (create_agent_session, monitor_phase_loop, etc.)
 #   lib/ci-helpers.sh       — sourced by pollers and review (ci_passed, classify_pipeline_failure, etc.)
 #   lib/load-project.sh     — sourced by env.sh when PROJECT_TOML is set