feat(m2): auth, JWT, invitations, bootstrap, RTOps SPA pages

Crypto + tokens
- app/core/security.py: Argon2id PasswordHasher (time_cost=2, memory_cost=
  64 MiB, parallelism=2) + opaque-token SHA-256 helpers (raw token shown
  once, only the hash lives in the DB).
- app/core/jwt_tokens.py: HS256, claims iss/sub/type/jti/iat/exp. Access
  1h, refresh 30d.

Services
- services/auth.py: login, refresh with token rotation + reuse-detection
  chain revoke, logout (idempotent), change_password (forces logout-all).
- services/invitations.py: create, preview, accept, revoke. Default 7d TTL.
- services/bootstrap.py: seeds the 3 system groups (admin/redteam/blueteam),
  consumes the install token, attaches the first user to admin.
- core/install_token.py: mints, persists in settings, marks consumed,
  regenerate hook for /diag/reset.

API
- POST /setup (consume install token, create 1st admin) + GET /setup
  (status).
- POST /auth/{login,refresh,logout,change-password} + GET /auth/me.
- POST /invitations + GET /invitations + GET /invitations/preview/<token> +
  POST /invitations/accept/<token> + POST /invitations/<id>/revoke.
- POST /diag/reset: test-only kill switch (truncate auth tables + mint
  fresh install token). Allowed in dev too (with WARNING log) so the e2e
  suite can run against a make-up stack; production locked out.

Middleware
- @require_auth populates g.current_user (snapshot dataclass, session
  closed before request handler runs).
- @require_perm(*codes): atomic perm union check; admin group bypasses.
  Perm catalogue lands in M3, scaffolding here.
- flask-limiter: 10/min/IP on /auth/login & /auth/refresh, 5/min on
  /auth/change-password & /setup, 10–20/min on invitation endpoints.
  Disabled in APP_ENV=test.

CLI
- flask --app app.cli metamorph print-install-token [--force]
- flask --app app.cli metamorph seed-mitre (M4 placeholder)

Refresh cookie metamorph_refresh: HttpOnly + Secure (localhost is a secure
context for modern browsers) + SameSite=Strict + Path=/api/v1/auth/.

Email validation: app.api._validation.Email permissive RFC-shape regex so
internal TLDs (.local/.corp/.test) are accepted — pydantic.EmailStr's
deliverability check is too strict for red-team labs.

Frontend
- lib/{api,auth}.ts: access token in module memory, refresh cookie,
  automatic 401-retry via /auth/refresh, useAuth() hook.
- components/{Layout,RequireAuth}.tsx + ui/{TextField,Alert}.tsx.
- pages/{Login,Setup,Register,Profile}.

Testing
- tests/test_auth_flow.py: 15 integration tests (24 backend total).
- e2e/tests/m2-auth.spec.ts: 8 Playwright tests (20 e2e total).
- tasks/testing-m2.md.

DoD: make test-api → 24 passed, make e2e → 20 passed; spec-reviewer pass
applied (Secure unconditional, refresh limit 10/min/IP).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/app/api/invitations.py

@@ -0,0 +1,146 @@
+"""Invitation endpoints — admin issues, invitee previews + accepts."""
+
+from __future__ import annotations
+
+import logging
+import uuid
+
+from flask import Blueprint, g, jsonify, make_response, request
+from pydantic import BaseModel, Field, ValidationError
+
+from app.api._validation import Email
+from app.core.auth_decorators import require_auth, require_perm
+from app.core.rate_limit import limiter
+from app.services import invitations as inv_svc
+
+bp = Blueprint("invitations", __name__, url_prefix="/invitations")
+log = logging.getLogger("metamorph.api.invitations")
+
+
+class CreateInvitationPayload(BaseModel):
+    email_hint: Email | None = None
+    group_ids: list[uuid.UUID] = Field(default_factory=list)
+    ttl_days: int | None = Field(default=None, ge=1, le=30)
+
+
+class AcceptInvitationPayload(BaseModel):
+    email: Email
+    password: str = Field(min_length=8)
+    display_name: str | None = None
+
+
+@bp.post("")
+@require_auth
+@require_perm("invitation.create")
+def create():
+    try:
+        payload = CreateInvitationPayload.model_validate(request.get_json(silent=True) or {})
+    except ValidationError as e:
+        return jsonify({"error": "invalid_request", "details": e.errors()}), 400
+
+    from datetime import timedelta
+
+    ttl = (
+        timedelta(days=payload.ttl_days)
+        if payload.ttl_days is not None
+        else inv_svc.INVITATION_TTL
+    )
+    result = inv_svc.create_invitation(
+        created_by_user_id=g.current_user.id,
+        email_hint=payload.email_hint,
+        group_ids=payload.group_ids,
+        ttl=ttl,
+    )
+    log.info(
+        "metamorph.invitation.created",
+        extra={
+            "invitation_id": str(result.invitation_id),
+            "by_user_id": str(g.current_user.id),
+            "expires_at": result.expires_at.isoformat(),
+        },
+    )
+    return make_response(
+        jsonify(
+            {
+                "id": str(result.invitation_id),
+                "token": result.raw_token,  # shown ONCE
+                "expires_at": result.expires_at.isoformat(),
+            }
+        ),
+        201,
+    )
+
+
+@bp.get("")
+@require_auth
+@require_perm("invitation.read")
+def list_active():
+    rows = inv_svc.list_active()
+    return jsonify(
+        [
+            {
+                "id": str(r.id),
+                "email_hint": r.email_hint,
+                "expires_at": r.expires_at.isoformat(),
+                "groups": [g.name for g in r.pre_assigned_groups],
+            }
+            for r in rows
+        ]
+    )
+
+
+@bp.post("/<invitation_id>/revoke")
+@require_auth
+@require_perm("invitation.revoke")
+def revoke(invitation_id: str):
+    try:
+        iid = uuid.UUID(invitation_id)
+    except ValueError:
+        return jsonify({"error": "invalid_id"}), 400
+    ok = inv_svc.revoke(iid)
+    if not ok:
+        return jsonify({"error": "not_revocable"}), 404
+    return jsonify({"ok": True})
+
+
+@bp.get("/preview/<token>")
+@limiter.limit("20 per minute")
+def preview(token: str):
+    p = inv_svc.preview(token)
+    return jsonify(
+        {
+            "is_valid": p.is_valid,
+            "reason": p.reason,
+            "email_hint": p.email_hint,
+            "expires_at": p.expires_at.isoformat(),
+            "groups": p.groups,
+        }
+    )
+
+
+@bp.post("/accept/<token>")
+@limiter.limit("10 per minute")
+def accept(token: str):
+    try:
+        payload = AcceptInvitationPayload.model_validate(request.get_json(silent=True) or {})
+    except ValidationError as e:
+        return jsonify({"error": "invalid_request", "details": e.errors()}), 400
+    try:
+        user_id = inv_svc.accept(
+            token,
+            email=payload.email,
+            password=payload.password,
+            display_name=payload.display_name,
+        )
+    except inv_svc.InvitationExpired:
+        return jsonify({"error": "invitation_expired"}), 410
+    except inv_svc.InvitationConsumed:
+        return jsonify({"error": "invitation_consumed"}), 410
+    except inv_svc.InvitationRevoked:
+        return jsonify({"error": "invitation_revoked"}), 410
+    except inv_svc.InvitationError as e:
+        return jsonify({"error": "invitation_invalid", "message": str(e)}), 400
+    except ValueError as e:
+        return jsonify({"error": "invalid_request", "message": str(e)}), 400
+
+    return make_response(jsonify({"ok": True, "user_id": str(user_id)}), 201)