refactor: consolidate extension system to general-only with manifest-driven architecture

- Remove all sector-specific extensions (construction, ecommerce, export,
  hotel, restaurant, tech) — only general-purpose extensions remain
- Move NE-bilaga and SRU export from extensions to core reports (lib/reports/)
- Move moms-box-mapping from extensions/export/shared to lib/vat/
- Replace per-extension API routes with catch-all dispatcher
  (app/api/extensions/ext/[...path]/route.ts)
- Add manifest.json for each extension with metadata, env vars, and deps
- Add api-routes.ts pattern for extension-defined API endpoints
- Add code generation scripts (generate-extension-registry, create-extension)
- Add extensions.config.json for opt-in extension loading
- Add extensions.schema.json for config validation
- Add email service interface with noop default (lib/email/service.ts)
- Add CI workflow (core-build.yml) to verify core builds with zero extensions
- Add migration 045: expand account_type CHECK for untaxed_reserves
- Update CLAUDE.md with comprehensive extension system documentation
- Update all report engines and bookkeeping services for new imports
- Clean up extensions.schema.json to only list existing extensions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/api/documents/[id]/link/route.ts

@@ -38,6 +38,7 @@ export async function POST(
     }
 
     const document = await linkToJournalEntry(
+      supabase,
       user.id,
       id,
       body.journal_entry_id,

app/api/documents/[id]/verify/route.ts

@@ -24,7 +24,7 @@ export async function POST(
   const { id } = await params
 
   try {
-    const result = await verifyIntegrity(user.id, id)
+    const result = await verifyIntegrity(supabase, user.id, id)
 
     return NextResponse.json({ data: result })
   } catch (error) {

app/api/documents/[id]/versions/route.ts

@@ -36,7 +36,7 @@ export async function POST(
 
     const buffer = await file.arrayBuffer()
 
-    const newVersion = await createNewVersion(user.id, id, {
+    const newVersion = await createNewVersion(supabase, user.id, id, {
       name: file.name,
       buffer,
       type: file.type,

app/api/documents/route.ts

@@ -38,7 +38,7 @@ export async function POST(request: Request) {
 
     const buffer = await file.arrayBuffer()
 
-    const document = await uploadDocument(user.id, {
+    const document = await uploadDocument(supabase, user.id, {
       name: file.name,
       buffer,
       type: file.type,