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-sec27-tests.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+set -uo pipefail
+
+# CASAN Plan-16 SEC-27 (X-02) — strip control/ANSI chars from log output.
+#
+# Log messages carry attacker-influenced data (action names, tool-output snippets).
+# A raw ESC/CSI sequence can rewrite a reviewer's terminal; a raw CR/LF can inject a
+# fake log line. casan_log now strips control chars (keeping tab). Proves the ESC
+# byte and embedded newlines are removed while the visible text survives.
+#
+# Deterministic; no model/network.
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/../scripts/bash/casan-paths.sh"
+PROJECT_ROOT="$CASAN_APP_ROOT"
+
+PASS=0; FAIL=0
+pass() { echo "PASS: $1"; PASS=$((PASS + 1)); }
+fail() { echo "FAIL: $1"; FAIL=$((FAIL + 1)); }
+
+echo "===== Plan-16 SEC-27: log control-char stripping ====="
+
+# shellcheck source=/dev/null
+source "$CASAN_HARNESS_ROOT/scripts/bash/casan-log.sh"
+
+PAYLOAD="$(printf 'start\033[31mRED\033[0m\nFAKE [ERROR] injected-audit-line')"
+OUT="$(casan_log error test "$PAYLOAD" 2>&1)"
+
+if printf '%s' "$OUT" | od -An -c | grep -q '033'; then
+  fail "ESC byte survived into the log (terminal-escape injection)"
+else
+  pass "ESC byte stripped from log output"
+fi
+
+LINES="$(printf '%s\n' "$OUT" | grep -c .)"
+[[ "$LINES" -eq 1 ]] \
+  && pass "embedded newline stripped — no injected second log line" \
+  || fail "log emitted $LINES lines (newline injection)"
+
+printf '%s' "$OUT" | grep -q "start" && printf '%s' "$OUT" | grep -q "RED" \
+  && pass "visible text preserved (only control bytes removed)" \
+  || fail "visible text lost"
+
+echo ""
+echo "===== SEC-27 SUMMARY: PASS=$PASS FAIL=$FAIL ====="
+[[ "$FAIL" -eq 0 ]] || exit 1