Add print badges, pagination, route splitting, JWT auth fixes, and list page alignment

- Fix equipment badge barcode not rendering (loading race condition)
- Fix printer QR code not rendering on initial load (same race condition)
- Add model image to equipment badge via imageurl from Model table
- Fix white-on-white machine number text on badge, tighten barcode spacing
- Add PaginationBar component used across all list pages
- Split monolithic router into per-plugin route modules
- Fix 25 GET API endpoints returning 401 (jwt_required -> optional=True)
- Align list page columns across Equipment, PCs, and Network pages
- Add print views: EquipmentBadge, PrinterQRSingle, PrinterQRBatch, USBLabelBatch
- Add PC Relationships report, migration docs, and CLAUDE.md project guide
- Various plugin model, API, and frontend refinements

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

shopdb/core/models/relationship.py

@@ -34,12 +34,12 @@ class AssetRelationship(BaseModel):
 
     relationshipid = db.Column(db.Integer, primary_key=True)
 
-    source_assetid = db.Column(
+    sourceassetid = db.Column(
         db.Integer,
         db.ForeignKey('assets.assetid'),
         nullable=False
     )
-    target_assetid = db.Column(
+    targetassetid = db.Column(
         db.Integer,
         db.ForeignKey('assets.assetid'),
         nullable=False
@@ -53,31 +53,31 @@ class AssetRelationship(BaseModel):
     notes = db.Column(db.Text)
 
     # Relationships
-    source_asset = db.relationship(
+    sourceasset = db.relationship(
         'Asset',
-        foreign_keys=[source_assetid],
+        foreign_keys=[sourceassetid],
         backref='outgoing_relationships'
     )
-    target_asset = db.relationship(
+    targetasset = db.relationship(
         'Asset',
-        foreign_keys=[target_assetid],
+        foreign_keys=[targetassetid],
         backref='incoming_relationships'
     )
-    relationship_type = db.relationship('RelationshipType', backref='asset_relationships')
+    relationshiptype = db.relationship('RelationshipType', backref='asset_relationships')
 
     __table_args__ = (
         db.UniqueConstraint(
-            'source_assetid',
-            'target_assetid',
+            'sourceassetid',
+            'targetassetid',
             'relationshiptypeid',
             name='uq_asset_relationship'
         ),
-        db.Index('idx_asset_rel_source', 'source_assetid'),
-        db.Index('idx_asset_rel_target', 'target_assetid'),
+        db.Index('idx_asset_rel_source', 'sourceassetid'),
+        db.Index('idx_asset_rel_target', 'targetassetid'),
     )
 
     def __repr__(self):
-        return f"<AssetRelationship {self.source_assetid} -> {self.target_assetid}>"
+        return f"<AssetRelationship {self.sourceassetid} -> {self.targetassetid}>"
 
 
 class MachineRelationship(BaseModel):