refactor(structure): promote app to repo root + remove redundant workspace cruft

Standard production layout: the OKR app (was nested under AINative_OKR_CASAN5/) is now
the repository root. No more wrapper directory.

- Promote AINative_OKR_CASAN5/* -> repo root (backend/ frontend/ packages/ apps/
  .specify/ docs/ infra/ nginx/ scripts/ + configs). Merge tool dirs: .gitea (kept the
  active deploy ci.yml, added harness-ci.yml + runbooks), .claude (agents/commands +
  launch.json), .github moved up.
- Remove redundant: 00_SUBMISSION_PACKAGE, scattered root notes (FPT_CASAN_Full.md,
  tu-tuong-casan.md, casan-tu-sinh..., casan_harness_assessment.md, source-review...,
  README_CASAN5_REFINED.md), casan-next-plans/ and optimize-docs/ (competition/planning
  artifacts — roadmap + design history preserved in git log / commit messages).
- Update all references to the old layout:
  - .gitea/workflows/{ci,harness-ci}.yml, .github/workflows/{ci,deploy}.yml:
    working-directory .; drop AINative_OKR_CASAN5/ prefix; .specify/{tests,scripts}
    -> packages/casan-harness/... (.specify/logs state kept)
  - .claude/launch.json, .gitea/*-runbook.md: path prefixes
  - CLAUDE.md, README.md: docs/input -> apps/okr/domain/input
  - policy-bundle.yaml: 8 policy paths -> packages/casan-harness/...; manifest re-signed
- secrets-scan.sh: fixture excludes -> new package/domain paths.

Full gate from the new root: PASS=64 FAIL=0 SKIP=3.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/output/casan/phase3-evidence/preflight/ollama-linux-via-tunnel-generate.json

@@ -0,0 +1 @@
+{"model":"ornith:9b","created_at":"2026-06-30T12:50:06.689834437Z","response":"OK","thinking":"The user wants me to return exactly \"OK\". This is a simple response with no coding or reasoning needed.","done":true,"done_reason":"stop","context":[248045,8678,198,2523,513,84811,402,11,449,1724,29768,904,4117,10505,17313,13,20500,2923,539,2923,303,264,31626,2424,11,1179,1121,13,5272,279,3766,7141,948,781,1438,13,2732,61446,11,4252,11,321,2050,25,3165,3133,1970,321,10033,1132,1092,369,2397,89257,2389,13,248046,198,248045,846,198,5423,6681,25,10092,248046,198,248045,74455,198,248068,198,760,1156,6587,728,310,460,6681,328,3793,3158,1061,369,264,4145,1965,440,874,10505,466,31626,4221,13,198,248069,271,3793],"total_duration":10540918012,"load_duration":273340262,"prompt_eval_count":72,"prompt_eval_duration":4831721000,"eval_count":27,"eval_duration":5387130000}