feat(server): improve context management (#15448)

#### PR Dependency Tree


* **PR #15448** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Added workspace artifact upload, browsing, removal, deduplication, and
library ownership support.
* Copilot now supports scoped document and artifact search, canvas
reading, live editor context, and frontend tools.
* Added scope and focus selectors with source-resolution receipts in
chat.
* Added embedding health, progress, synchronization, and retrieval
capabilities.
* Added BYOK policy visibility, provider restrictions, endpoint dialect
selection, and validation.
* Added delegated editor interactions and userdata document
authorization.

* **Bug Fixes**
* Improved attachment handling, cancellation, access control, retrieval
fallbacks, workspace synchronization, and configuration validation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/scripts/self-host-predeploy.js

@@ -47,20 +47,6 @@ function runPrismaMigrations() {
   });
 }
 
-function repairPgvectorEmbeddingTables() {
-  console.log('repairing copilot pgvector embedding tables.');
-  const sql = fs.readFileSync(
-    path.join(import.meta.dirname, 'repair-pgvector-embedding-tables.sql'),
-    'utf-8'
-  );
-  execSync('yarn prisma db execute --stdin --schema schema.prisma', {
-    encoding: 'utf-8',
-    env: process.env,
-    input: sql,
-    stdio: ['pipe', 'inherit', 'inherit'],
-  });
-}
-
 function runDataMigrations() {
   console.log('running data migrations.');
   execSync('yarn cli run', {
@@ -109,5 +95,4 @@ function fixFailedMigrations() {
 prepare();
 fixFailedMigrations();
 runPrismaMigrations();
-repairPgvectorEmbeddingTables();
 runDataMigrations();