feat(creds): Phase 1 — Authorization header + SNMP community capture

Closes the cred-coverage gap for 7 services that already had the data
on the wire but never landed it in the Credential table:

- SNMP — community string lands as secret_kind="snmp_community",
  principal=None (v1/v2c has no per-user identity, the community IS
  the auth).
- SIP — Digest response hash, previously buried in the auth= header
  dump, now classify_authorization()-extracted.
- HTTP / HTTPS — Authorization header was in the headers JSON but
  never extracted. Now Basic decodes to plaintext, Bearer →
  http_bearer (principal=None), Digest → http_digest_md5.
- K8s — already extracted Authorization but didn't normalize. Service-
  account JWTs flow through as Bearer.
- Docker API — headers absent entirely. Adds the headers JSON dump
  and runs Authorization through the classifier.
- Elasticsearch — five distinct request handlers; each gains a
  per-handler _cred_fields() helper.

Adds canonical templates/syslog_bridge.py:classify_authorization().
Recognised: Basic / Bearer / Token / Digest. Unknown schemes (NTLM,
AWS4-HMAC, Negotiate) return None; the header still rides in the
ambient SD-block but isn't normalized as a credential. The SD shape
on the wire collapses sip_digest_md5 into http_digest_md5 — same
algorithm, so cross-protocol reuse correlates correctly when (rare)
nonce collisions allow.

Drive-by repair of tests/core/test_fingerprinting.py:

- The pre-existing `test_http_useragent_extracted` asserted both that
  add_bounty was called exactly once AND that the UA payload carried
  `path` and `method` fields. Both wrong since this session opened:
  the http_quirks fingerprint added later fires too, and the UA
  payload never actually included path/method despite the assertion.
- Adds `path`/`method` to the UA fingerprint payload (real operator
  value: "Nikto hit /admin" beats "Nikto seen on this decky").
- Replaces `assert_awaited_once` with a `_find_ua_bounty()` helper
  that filters add_bounty calls by `fingerprint_type`. New fingerprint
  families landing later won't retroactively break old tests.
- Updates the two credential-bearing tests to use the post-DEBT-039
  native shape (`secret_b64` / `principal`) and `upsert_credential`,
  not the deleted legacy `username+password` adapter.

Also rebuilds the per-service fake `syslog_bridge` modules in
tests/service_testing/{conftest,test_imap,test_pop3,test_snmp,test_mqtt,test_smtp}.py
to expose `encode_secret` + `classify_authorization`. Service templates
that import either now no longer fail at test collection.

173 tests pass in the touched scope. Phases 2-7 still pending.

decnet/templates/sip/server.py

@@ -8,7 +8,12 @@ Authorization header and call metadata, then responds with 401 Unauthorized.
 import asyncio
 import os
 import re
-from syslog_bridge import syslog_line, write_syslog_file, forward_syslog
+from syslog_bridge import (
+    classify_authorization,
+    forward_syslog,
+    syslog_line,
+    write_syslog_file,
+)
 
 NODE_NAME = os.environ.get("NODE_NAME", "pbx")
 SERVICE_NAME   = "sip"
@@ -58,6 +63,13 @@ def _handle_message(data: bytes, src_addr) -> bytes | None:
         m = re.search(r'username="([^"]+)"', auth_header)
         username = m.group(1) if m else ""
 
+    # SIP Digest is the same shape as HTTP Digest (RFC 7616 derived from
+    # RFC 2617). classify_authorization handles it identically — emits
+    # secret_kind="http_digest_md5", which is correct: the cred is the
+    # MD5 hash response, regardless of whether it rode in over SIP or
+    # HTTP. Reuse-analytics correlates across both.
+    cred = classify_authorization(auth_header)
+
     _log(
         "request",
         src=src_addr[0],
@@ -67,6 +79,7 @@ def _handle_message(data: bytes, src_addr) -> bytes | None:
         to=headers.get("to", ""),
         username=username,
         auth=auth_header[:256],
+        **(cred or {}),
     )
 
     if method in ("REGISTER", "INVITE", "OPTIONS"):