v0.1.1: System default AI config, configurable URLs, single .env, website refactor

backend/prisma/schema.prisma

@@ -4,7 +4,7 @@ generator client {
 
 datasource db {
   provider = "sqlite"
-  url      = env("DATABASE_URL")
+  url      = env("BACKEND_DATABASE_URL")
 }
 
 model User {
@@ -94,16 +94,17 @@ model Task {
 }
 
 model Settings {
-  userId          String @id
-  aiProvider      String @default("groq")
-  aiApiKey        String?
-  aiModel         String @default("llama-3.3-70b-versatile")
-  aiBaseUrl       String?
-  journalPrompt   String?
-  language        String @default("en")
-  timezone        String @default("UTC")
-  providerSettings String?
+  userId            String @id
+  aiProvider        String @default("groq")
+  aiApiKey          String?
+  aiModel           String @default("llama-3.3-70b-versatile")
+  aiBaseUrl         String?
+  journalPrompt     String?
+  language          String @default("en")
+  timezone          String @default("UTC")
+  providerSettings  String?
   journalContextDays Int @default(10)
+  useSystemDefault  Boolean @default(true)
 
   user User @relation(fields: [userId], references: [id], onDelete: Cascade)
 }