v1.6.5: fix attendance unique constraint, schema sync, seed script

- Change attendance idx_attendance_user_date from unique to index (allow multiple shifts per day)
- Reset migrations to single baseline init migration
- Add seed script with admin user (admin/admin)
- Update CLAUDE.md with migration workflow documentation
- Various frontend fixes (queries, pages, hooks)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

prisma/schema.prisma

@@ -32,7 +32,7 @@ model attendance {
   users                    users                    @relation(fields: [user_id], references: [id], onDelete: Cascade, onUpdate: NoAction, map: "attendance_ibfk_1")
   attendance_project_logs  attendance_project_logs[]
 
-  @@unique([user_id, shift_date], map: "idx_attendance_user_date")
+  @@index([user_id, shift_date], map: "idx_attendance_user_date")
   @@index([user_id, departure_time], map: "idx_attendance_user_departure")
   @@index([project_id], map: "idx_project_id")
 }
@@ -101,7 +101,7 @@ model company_settings {
   vat_id            String?   @db.VarChar(50)
   custom_fields     String?   @db.LongText
   logo_data         Bytes?
-  logo_data_dark    Bytes?
+  logo_data_dark    Bytes?              @db.MediumBlob
   quotation_prefix  String?   @db.VarChar(20)
   default_currency  String?   @default("CZK") @db.VarChar(10)
   default_vat_rate  Decimal?  @default(21.00) @db.Decimal(5, 2)
@@ -112,7 +112,7 @@ model company_settings {
   order_type_code   String?   @db.VarChar(10)
   invoice_type_code String?   @db.VarChar(10)
   require_2fa              Boolean   @default(false)
-  break_threshold_hours    Decimal?  @default(6) @db.Decimal(4, 2)
+  break_threshold_hours    Decimal?  @default(6.00) @db.Decimal(4, 2)
   break_duration_short     Int?      @default(15)
   break_duration_long      Int?      @default(30)
   clock_rounding_minutes   Int?      @default(15)
@@ -389,7 +389,7 @@ model quotation_items {
 model quotations {
   id                 Int               @id @default(autoincrement())
   quotation_number   String?           @unique @db.VarChar(50)
-  project_code       String?           @db.VarChar(50)
+  project_code       String?           @db.VarChar(100)
   customer_id        Int?
   created_at         DateTime?         @default(now()) @db.DateTime(0)
   valid_until        DateTime?         @db.Date
@@ -437,7 +437,7 @@ model received_invoices {
   file_mime      String?                  @db.VarChar(100)
   file_size      Int?                     @db.UnsignedInt
   notes          String?                  @db.Text
-  uploaded_by    Int?
+  uploaded_by    Int?                     @db.UnsignedInt
   created_at     DateTime                 @default(now()) @db.DateTime(0)
   modified_at    DateTime                 @default(now()) @db.DateTime(0)
 
@@ -449,7 +449,7 @@ model received_invoices {
 /// This model or at least one of its fields has comments in the database, and requires an additional setup for migrations: Read more: https://pris.ly/d/database-comments
 model refresh_tokens {
   id               Int       @id @default(autoincrement()) @db.UnsignedInt
-  user_id          Int
+  user_id          Int       @db.UnsignedInt
   token_hash       String    @unique(map: "token_hash") @db.VarChar(64)
   expires_at       DateTime  @db.DateTime(0)
   replaced_at      DateTime? @db.DateTime(0)
@@ -632,7 +632,7 @@ model invoice_alert_log {
   sent_at      DateTime @default(now()) @db.DateTime(0)
   created_at   DateTime @default(now()) @db.DateTime(0)
 
-  @@unique([invoice_type, invoice_id, alert_type])
+  @@unique([invoice_type, invoice_id, alert_type], map: "invoice_type_invoice_id_alert_type")
 }
 
 enum received_invoices_status {