Import-API hardening: network device IP endpoint + communicationtypes seeder

The legacy-import surface (docs/IMPORT-API.md) is the schema-agnostic contract
every adopting site targets; these close two gaps found while mapping the WJ
classic import.

Network device IP: POST/PUT /api/network now accept an `ipaddress` and
materialize a primary Communication (mirroring the printer route), and GET
(list + detail + create/update result) surface it. Previously a network
device's IP - which lives in the communications table, not on the extension -
had no HTTP import path at all.

communicationtypes seed: `flask seed reference-data` now seeds the eight
canonical communication types (IP/Serial/Network_Interface/USB/Parallel/VNC/
FTP/DNC), which IMPORT-API.md already documents as a prerequisite. The IP type
must exist before any asset import so printer/network routes can attach an IP.
There is no CRUD endpoint for these, so seeding is the only path.

Tests: network create/update IP upsert + GET surfacing + seed creates IP type.
204 targeted tests pass; naming + pyflakes green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

shopdb/cli/__init__.py

@@ -127,7 +127,8 @@ def seed_cli():
 def seed_reference_data():
     """Seed reference data (model types, statuses, etc.)."""
     from shopdb.extensions import db
-    from shopdb.core.models import ModelType, OperatingSystem, AssetStatus, LocationType
+    from shopdb.core.models import (ModelType, OperatingSystem, AssetStatus,
+                                     LocationType, CommunicationType)
     from shopdb.core.models.relationship import RelationshipType
 
     # Model types (type the vendor models catalog)
@@ -178,6 +179,23 @@ def seed_reference_data():
         if not LocationType.query.filter_by(locationtype=lt).first():
             db.session.add(LocationType(locationtype=lt, isactive=True))
 
+    # Communication types (how an asset is reached / its interfaces). The IP
+    # type is what the printer + network create routes attach an ipaddress to,
+    # so it must exist before any asset import.
+    comm_types = [
+        ('IP', 'IP address / network reachable'),
+        ('Serial', 'Serial (RS-232) connection'),
+        ('Network_Interface', 'Physical network interface (MAC/port)'),
+        ('USB', 'USB connection'),
+        ('Parallel', 'Parallel port connection'),
+        ('VNC', 'VNC remote access'),
+        ('FTP', 'FTP file transfer'),
+        ('DNC', 'Direct numerical control link'),
+    ]
+    for comtype, description in comm_types:
+        if not CommunicationType.query.filter_by(comtype=comtype).first():
+            db.session.add(CommunicationType(comtype=comtype, description=description))
+
     # Operating systems
     os_list = [
         {'osname': 'Windows 10', 'osversion': '10.0'},