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/tests/phase-sec21-tests.sh

@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+set -uo pipefail
+
+# CASAN Plan-16 SEC-21 (ARCH-07) — bounded model timeout + per-run call budget.
+#
+# A 180s-per-call timeout across many steps let a hung model stall a run for tens
+# of minutes. Now the per-call timeout is lower + configurable, and total model
+# calls per run are capped so a wedged model cannot amplify into a DoS. Proves the
+# budget refuses once exhausted, and no cap set means no limit (dev default).
+#
+# Deterministic (budget is checked BEFORE any backend call, so it holds whether or
+# not a model is reachable). No network required.
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/../scripts/bash/casan-paths.sh"
+PROJECT_ROOT="$CASAN_APP_ROOT"
+MC="$CASAN_HARNESS_ROOT/scripts/bash/model-call.py"
+WORK="$(mktemp -d)"
+trap 'git -C "$PROJECT_ROOT" checkout -- .specify/logs/level5/provider-usage.jsonl 2>/dev/null; rm -rf "$WORK"' EXIT
+
+PASS=0; FAIL=0
+pass() { echo "PASS: $1"; PASS=$((PASS + 1)); }
+fail() { echo "FAIL: $1"; FAIL=$((FAIL + 1)); }
+
+echo "===== Plan-16 SEC-21: model timeout + per-run call budget ====="
+
+# Per-call timeout is reduced from 180s and configurable.
+grep -q 'timeout=180' "$MC" && fail "hardcoded 180s timeout still present" \
+  || pass "no hardcoded 180s per-call timeout"
+grep -q 'CASAN_MODEL_TIMEOUT_SEC' "$MC" \
+  && pass "per-call timeout is configurable via CASAN_MODEL_TIMEOUT_SEC" \
+  || fail "timeout not configurable"
+
+# Budget: cap=1. Call 1 charges the budget (proceeds); call 2 is refused BEFORE any
+# backend work, with a clear budget error, regardless of model availability.
+echo "hello" > "$WORK/p.txt"
+CNT="$WORK/counter"
+export CASAN_MODEL_MAX_CALLS=1 CASAN_MODEL_CALL_COUNTER_FILE="$CNT"
+
+python3 "$MC" "$WORK/p.txt" "$WORK/o1.json" --role classify >/dev/null 2>&1  # charges to 1
+ERR2="$(python3 "$MC" "$WORK/p.txt" "$WORK/o2.json" --role classify 2>&1 >/dev/null)"; RC2=$?
+if [[ "$RC2" -ne 0 ]] && echo "$ERR2" | grep -q "run_call_budget_exceeded"; then
+  pass "call over budget is REFUSED (rc=$RC2, budget error)"
+else
+  fail "over-budget call not refused (rc=$RC2 err='$ERR2')"
+fi
+
+# No cap set → no budget error (dev default unchanged).
+unset CASAN_MODEL_MAX_CALLS CASAN_MODEL_CALL_COUNTER_FILE
+ERR3="$(python3 "$MC" "$WORK/p.txt" "$WORK/o3.json" --role classify 2>&1 >/dev/null || true)"
+echo "$ERR3" | grep -q "run_call_budget_exceeded" \
+  && fail "budget error fired with no cap set" \
+  || pass "no cap set → no budget limit (dev default)"
+
+echo ""
+echo "===== SEC-21 SUMMARY: PASS=$PASS FAIL=$FAIL ====="
+[[ "$FAIL" -eq 0 ]] || exit 1