Phase 7A: wire ADR-001 asset position contract surface

Lock the position-resolution columns from ADR-001 in code so
resolve_asset_position's relationship walk activates.

Schema
- Asset.mapleft -> Asset.mapx, Asset.maptop -> Asset.mapy
- Location.mapx / Location.mapy added (fallback for priority 3 of the
  ADR-001 resolution chain)
- AssetRelationship.label (free-text nuance per ADR-001)
- AssetRelationship.inheritsposition (bool, server_default true, controls
  whether the resolved-position walk follows the edge)
- RelationshipType.propagatesthroughid (self-FK; sibling-propagation rail)

Seeds
- Three canonical ADR-001 relationship types created idempotently:
  partof, controls, connectedto
- controls.propagatesthroughid wired to partof (partof + connectedto stay
  null per ADR-001 table). Both via Alembic migration AND CLI seed command
  so a fresh test fixture and a sister-site deploy both end up correct.
- Legacy connection types (Serial Cable, Direct Ethernet, USB, WiFi,
  Dualpath) retained for backward compat with pre-1.0 relationship rows.

Resolver
- shopdb.api.resolve_asset_position now walks inheritsposition=true edges
  of type partof (then controls), recursively, depth-capped at 3 with
  visited-set cycle protection. Inactive edges + non-inheritable types
  are skipped. Falls through to the existing location fallback when the
  walk yields nothing.

Tests
- 11 new test_api_namespace cases cover: partof walk, controls-after-
  partof ordering, connectedto skipped, inheritsposition=false skipped,
  recursion, cycle break, depth-3 cap, self-beats-related, related-beats-
  location, inactive-edge skip.
- 111 tests pass. Naming/style check green.

Migration
- migrations/versions/7a01_adr001_position_contract.py:
  - alter_column renames on assets (no data loss)
  - add_column on locations + relationshiptypes + assetrelationships
  - idempotent seed of three ADR types + propagation FK wire-up
  - downgrade reverses + best-effort deletion of seeded types that have
    no FK refs

Backend rename (mapleft/maptop -> mapx/mapy)
- shopdb/core/api/assets.py
- plugins/{computers,equipment,network,printers}/api/...
- scripts/migration/migrate_assets.py
- Legacy Machine model + machines API + import_from_mysql.py UNCHANGED
  (per ADR-001 Machine retires; not part of the asset contract)

Frontend rename
- frontend/src/components/ShopFloorMap.vue
- frontend/src/views/{MapEditor.vue, pcs/{PCDetail,PCForm}.vue,
  printers/{PrinterDetail,PrinterForm}.vue,
  machines/{MachineDetail,MachineForm}.vue,
  network/NetworkDeviceForm.vue}
- Form field labels + v-model bindings + computed flags switched in
  lockstep with the backend.

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

shopdb/core/models/asset.py

@@ -105,9 +105,9 @@ class Asset(BaseModel, SoftDeleteMixin, AuditMixin):
         nullable=True
     )
 
-    # Floor map position
-    mapleft = db.Column(db.Integer, comment='X coordinate on floor map')
-    maptop = db.Column(db.Integer, comment='Y coordinate on floor map')
+    # Floor map position (ADR-001: asset-specific override; nullable)
+    mapx = db.Column(db.Integer, comment='X coordinate on floor map (ADR-001)')
+    mapy = db.Column(db.Integer, comment='Y coordinate on floor map (ADR-001)')
 
     # Notes
     notes = db.Column(db.Text, nullable=True)
@@ -160,16 +160,13 @@ class Asset(BaseModel, SoftDeleteMixin, AuditMixin):
         """
         Get location data from a related asset if this asset has none.
 
-        Returns dict with locationid, location_name, mapleft, maptop, and
+        Returns dict with locationid, location_name, mapx, mapy, and
         inherited_from (assetnumber of source asset) if location was inherited.
         Returns None if no location data available.
         """
-        # If we have our own location data, don't inherit
-        if self.locationid is not None or (self.mapleft is not None and self.maptop is not None):
+        if self.locationid is not None or (self.mapx is not None and self.mapy is not None):
             return None
 
-        # Check related assets for location data
-        # Look in both incoming and outgoing relationships
         related_assets = []
 
         if hasattr(self, 'incoming_relationships'):
@@ -182,14 +179,13 @@ class Asset(BaseModel, SoftDeleteMixin, AuditMixin):
                 if rel.targetasset and rel.isactive:
                     related_assets.append(rel.targetasset)
 
-        # Find first related asset with location data
         for related in related_assets:
-            if related.locationid is not None or (related.mapleft is not None and related.maptop is not None):
+            if related.locationid is not None or (related.mapx is not None and related.mapy is not None):
                 return {
                     'locationid': related.locationid,
                     'locationname': related.location.locationname if related.location else None,
-                    'mapleft': related.mapleft,
-                    'maptop': related.maptop,
+                    'mapx': related.mapx,
+                    'mapy': related.mapy,
                     'inheritedfrom': related.assetnumber
                 }
 
@@ -234,10 +230,10 @@ class Asset(BaseModel, SoftDeleteMixin, AuditMixin):
                 if result.get('locationid') is None:
                     result['locationid'] = inherited['locationid']
                     result['locationname'] = inherited['locationname']
-                if result.get('mapleft') is None:
-                    result['mapleft'] = inherited['mapleft']
-                if result.get('maptop') is None:
-                    result['maptop'] = inherited['maptop']
+                if result.get('mapx') is None:
+                    result['mapx'] = inherited['mapx']
+                if result.get('mapy') is None:
+                    result['mapy'] = inherited['mapy']
 
         # Include extension data if requested
         if include_type_data: