docs(settings): Update README + Copilot instructions; bump Program Info to 2025.1.0-alpha.11

README: Add System Settings API endpoints; describe new tabbed Settings layout with role gating; add Vite dev proxy tip to use relative /api paths.
Copilot instructions: Note SystemSetting key–value store in data model; document system_settings.py (CRUD + supplement-table convenience endpoint); reference apiSystemSettings.ts; note defaults seeding via init_defaults.py.
Program Info: Bump version to 2025.1.0-alpha.11; changelog explicitly tied to the Settings page (Events tab: supplement-table URL moved; Academic Calendar: set active period; proxy note); README docs mention.
No functional changes to API or UI code in this commit; documentation and program info only.

models/models.py

@@ -285,3 +285,23 @@ class Conversion(Base):
         UniqueConstraint('source_event_media_id', 'target_format',
                          'file_hash', name='uq_conv_source_target_hash'),
     )
+
+
+# --- SystemSetting: Flexible key-value store for system-wide configuration ---
+class SystemSetting(Base):
+    __tablename__ = 'system_settings'
+
+    key = Column(String(100), primary_key=True, nullable=False)
+    value = Column(Text, nullable=True)
+    description = Column(String(255), nullable=True)
+    updated_at = Column(TIMESTAMP(timezone=True),
+                        server_default=func.current_timestamp(),
+                        onupdate=func.current_timestamp())
+
+    def to_dict(self):
+        return {
+            "key": self.key,
+            "value": self.value,
+            "description": self.description,
+            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
+        }