Add installer/script delivery metadata to the core software model

AppVersion gains sha256 and silentargs so the endpoint update_app push can pin exact installer bytes and carry per-version silent switches; Application gains installersha256 for the app-level install source. New ShopDB-hosted script library (Script model plus scripts API) backs run_script delivery, with the body fetched by digest on push rather than pre-staged or sent over the command wire. Two idempotent migrations with real downgrades. Script added to the shopdb.api contract surface for plugin use.

shopdb/core/models/application.py

@@ -34,6 +34,11 @@ class Application(BaseModel):
         comment='Required on all PCs (drives the software-compliance report)'
     )
     image = db.Column(db.String(255))
+    # Digest of the app-level uploaded installer (installpath). Lets the
+    # endpoint update_app push resolve an install source by app alone, with no
+    # AppVersion row: the agent fetches the pinned bytes and verifies this hash.
+    # Stamped on package upload; null when installpath is a site share path.
+    installersha256 = db.Column(db.String(64))
 
     # Relationships
     supportteam = db.relationship('SupportTeam', back_populates='applications')
@@ -70,6 +75,12 @@ class AppVersion(db.Model):
     notes = db.Column(db.String(255))
     dateadded = db.Column(db.DateTime, default=_utcnow)
     isactive = db.Column(db.Boolean, default=True)
+    # Delivery metadata for the endpoint installer push. sha256 pins the exact
+    # bytes the agent must fetch (warn-not-block for now; hardened later);
+    # silentargs carries this version's unattended-install switches because
+    # homegrown EXEs vary by developer (MSI is uniform via msiexec).
+    sha256 = db.Column(db.String(64))
+    silentargs = db.Column(db.String(255))
 
     # Relationships
     application = db.relationship('Application', back_populates='versions')
@@ -88,7 +99,9 @@ class AppVersion(db.Model):
             'releasedate': self.releasedate.isoformat() if self.releasedate else None,
             'notes': self.notes,
             'dateadded': self.dateadded.isoformat() + 'Z' if self.dateadded else None,
-            'isactive': self.isactive
+            'isactive': self.isactive,
+            'sha256': self.sha256,
+            'silentargs': self.silentargs
         }
 
     def __repr__(self):