feat(connect): Peppol through the connector (hosted proxy, instance transport, ownership ledger) (#2177)

* feat(connect): peppol connector foundation: capability, ledger/budget service, quota

Adds the storage + package shape for brokering Peppol through the connector with
the same one-address + rate-budget model as bank/skatteverket: a peppol
capability (connector-gated, free on hosted), peppol as a ledger + upstream
service, a conservative rate budget, and a migration extending the ledger
service CHECK and the per-key limits (peppol_connections_per_company). Proxy
route + instance-side Qvalia reroute follow. Switch-on gated on the Qvalia
brokering-terms check.

(cherry picked from commit 3cc0da6a3, migration renumbered 20260902190000)

Signed-off-by: Jakob Wennberg <jakob.wennberg@arcim.io>
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMUUom4fUk6zi4xYZSSfat

* feat(connect): Peppol through the connector: hosted proxy, instance transport, ownership ledger

Completes the Peppol upstream for self-hosted instances on the connector
(WS3): an instance with a connector key carrying the peppol scope and no
Qvalia keys of its own sends and receives e-invoices through Arcim's
contracted access point, the same way bank and Skatteverket already route.

Hosted: app/api/connect/peppol/[...path] speaks the PeppolTransport
operations (lookup, submit, status, evidence, recipient PUT/DELETE, inbound
list/xml) rather than proxying Qvalia paths, because the Qvalia account is
shared by every hosted company and every instance: reads must be scoped to
what the caller owns, and the inbound read endpoint is destructive for the
whole account. Ownership: a receiving registration is a ledger row (service
peppol, participant id in account_uids, sha256 in handle_hash so one key
holds a participant at a time); outbound submissions land in the new
connector_peppol_submissions table and gate status/evidence; inbound
documents are served from the hosted archive filtered by the participants
the key holds. Per-company quota (peppol_connections_per_company), the
shared PEPPOL_RECEIVING_MAX_REGISTRATIONS cap, and the global peppol rate
budget apply. Provider failures cross as CONNECTOR_UPSTREAM_ERROR with the
adapter's retryable flag (422 or 502).

Instance: lib/invoices/transports/connector.ts implements PeppolTransport
over that API and registers itself in connector mode (key present, no
QVALIA_* keys); getPeppolTransportAvailability() defaults to it when no
provider is selected, so an instance needs no PEPPOL_TRANSPORT_PROVIDER.
Webhooks are not brokered; the existing outbound status poll covers it.
Hosted is byte-identical: it has its own keys, so connector mode is never on.

Docs: SELF-HOSTING.md, SOVEREIGN.md, .env.example. Switch-on for third-party
instances stays gated on the Qvalia brokering-terms check; without the scope
every operation answers 403.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMUUom4fUk6zi4xYZSSfat
Signed-off-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>

* fix(connect): authorize Peppol participants per key, harden the proxy after review

Review follow-ups on #2177. Authorization: a key may only register (and send
as) participant identifiers Arcim recorded on the key at issuance
(connector_keys.peppol_participants, migration 20260902191000) or the
licensee's own org number, and a document may only be submitted as a sender
the key has registered; X-Connector-Company stays an opaque per-company ref.
Cap: the shared access-point cap now counts fresh pending reservations and is
re-checked after this request's own reservation, so concurrent registrations
cannot both pass. Inbound: both halves of the participant id are filtered in
the archive query (over-fetched, then exact-pair checked), so foreign rows
sharing an identifier cannot consume the limit. Delete: deregistration is a
required transport capability, checked before the ledger row is revoked, and
registration refuses an access point that cannot deregister. Instance
transport: the hosted URL must be https (loopback http only, same rule as
getConnectorConfig), and the response body is read inside the timeout window
with body-read failures mapped to retryable transport errors.
issue-connector-key.ts gains --peppol-participants and
--peppol-connections-per-company. Declined: NOT VALID on the ledger CHECK
(the table is empty until keys are issued; the validated scan is instant).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMUUom4fUk6zi4xYZSSfat
Signed-off-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>

* fix(connect): bind Peppol ownership to the instance company, query exact participant pairs

Second review round on #2177. Ownership is now (key, company_ref), not key
alone: a sender must be registered under the same company header, status and
evidence reads look the submission up under the header company, DELETE and
re-registration refuse a participant the key holds for another company, so
one company on a multi-company instance cannot act on another company's
registration through the shared key. The instance transport resolves the
owning company from its own peppol_deliveries / peppol_registrations rows
before status, evidence and deregistration calls (deps.companyFor,
deps.companyForParticipant, wired in transports/index.ts). Inbound listing
stays key-wide (the instance routes documents to its own companies by its
own registrations). The archive query now runs one exact-pair query per
scheme (scheme fixed, that scheme's identifiers), so neither foreign nor
cross-pair rows can consume the limit.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMUUom4fUk6zi4xYZSSfat
Signed-off-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>

---------

Signed-off-by: Jakob Wennberg <jakob.wennberg@arcim.io>
Signed-off-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

lib/invoices/__tests__/peppol-registration.test.ts

@@ -113,6 +113,7 @@ describe('registerCompanyForPeppolReceiving', () => {
       participant: { scheme: '0007', identifier: '5595386219' },
       businessCard: expect.objectContaining({ companyName: 'Arcim Technology AB', orgNumber: '5595386219' }),
       documentTypes: PEPPOL_RECEIVING_DOCUMENT_TYPES,
+      tenantReference: 'company-1',
     })
     const inserted = calls.find((c) => c.method === 'insert')
     expect(inserted?.args[0]).toMatchObject({ status: 'pending', participant_identifier: '5595386219', company_id: 'company-1' })

lib/invoices/__tests__/peppol-transport.test.ts

@@ -36,6 +36,18 @@ describe('Peppol transport registry', () => {
     }
   })
 
+  it('defaults to the connector transport when that is the only registered adapter and no provider is selected', () => {
+    cleanups.push(registerPeppolTransport(makeTransport('connector')))
+    expect(getPeppolTransportAvailability()).toEqual({ available: true, provider: 'connector' })
+    // An explicit selection still wins, and still refuses an absent adapter.
+    process.env.PEPPOL_TRANSPORT_PROVIDER = 'qvalia'
+    expect(getPeppolTransportAvailability()).toEqual({
+      available: false,
+      provider: null,
+      reason: 'provider_adapter_unavailable',
+    })
+  })
+
   it('stays truthfully unavailable until a provider is selected', () => {
     expect(getPeppolTransportAvailability()).toEqual({
       available: false,