chore: update postgresql.conf and contracts comments for Zero

- Replace Electric SQL references in postgresql.conf with Zero-cache
- Clean Electric SQL comments in chat-comments.types.ts and chat-messages.types.ts

docker/postgresql.conf

@@ -1,11 +1,11 @@
-# PostgreSQL configuration for Electric SQL
+# PostgreSQL configuration for SurfSense
 # This file is mounted into the PostgreSQL container
 
 listen_addresses = '*'
 max_connections = 200
 shared_buffers = 256MB
 
-# Enable logical replication (required for Electric SQL)
+# Enable logical replication (required for Zero-cache real-time sync)
 wal_level = logical
 max_replication_slots = 10
 max_wal_senders = 10

surfsense_web/contracts/types/chat-comments.types.ts

@@ -6,7 +6,7 @@ import { z } from "zod";
 export const rawComment = z.object({
 	id: z.number(),
 	message_id: z.number(),
-	thread_id: z.number(), // Denormalized for efficient Electric subscriptions
+	thread_id: z.number(), // Denormalized for efficient per-thread sync
 	parent_id: z.number().nullable(),
 	author_id: z.string().nullable(),
 	content: z.string(),

surfsense_web/contracts/types/chat-messages.types.ts

@@ -1,7 +1,7 @@
 import { z } from "zod";
 
 /**
- * Raw message from database (Electric SQL sync)
+ * Raw message from database (real-time sync)
  */
 export const rawMessage = z.object({
 	id: z.number(),