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>

packages/casan-harness/scripts/bash/tenant-paths.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# CASAN Plan-16 SEC-23 (MT-01) — tenant-scoped state path resolver. SOURCE this.
+#
+# When CASAN_TENANT_ID is set, exports per-tenant locations for state that would
+# otherwise be global (control-plane settings + its audit chain, telemetry, audit),
+# so each subsystem writes under its own tenant partition. Each var is only set if
+# not already overridden (explicit env wins). An invalid tenant id fails CLOSED.
+#
+# Usage:  source tenant-paths.sh
+# (control-plane-settings.py is tenant-aware on its own via CASAN_TENANT_ID; this
+#  resolver covers the bash subsystems that read path env vars.)
+
+_CASAN_TP_DIR="$(cd "$(dirname "${BASH_SOURCE[0]:-$0}")" && pwd)"
+_CASAN_TS="$_CASAN_TP_DIR/tenant-store.sh"
+
+_casan_tp_set() {  # <var-name> <logical-name>
+  local var="$1" name="$2" path
+  [[ -n "${!var:-}" ]] && return 0            # explicit override wins
+  path="$(bash "$_CASAN_TS" resolve "$name" 2>/dev/null)" || return 1
+  export "$var=$path"
+}
+
+if [[ -n "${CASAN_TENANT_ID:-}" ]]; then
+  if ! bash "$_CASAN_TS" id >/dev/null 2>&1; then
+    echo "TENANT_PATHS_DENIED invalid or missing tenant id" >&2
+    return 1 2>/dev/null || exit 1
+  fi
+  _casan_tp_set CASAN_CP_STORE_FILE     control-plane/settings.json
+  _casan_tp_set CASAN_CP_KEY_DIR        control-plane/keys
+  _casan_tp_set CASAN_METRICS_DIR       telemetry/cost
+  _casan_tp_set CASAN_TENANT_AUDIT_DIR  audit
+fi