init: lab project bootstrapped from isletmem-kovakcrm

- CRM domain modules removed (customers, services, software, calendar, tasks, invoices, leads, finance, etc.)
- DLS branding: package name=lab, logo wordmark, sidebar nav, header CTA
- Tenant layer extended with kind dimension (lab|clinic) + requireTenantKind helper
- Schema rewritten for DLS domain: jobs, job_files, job_status_history, prosthetics, connections, finance_entries, notifications
- Onboarding form: clinic/lab account-type selection + auto-generated memberNumber
- Placeholder routes for jobs/{inbound,outbound,new}, products, finance, connections
- PDF spec + spec.md under belgeler/
- db: lab database + 13 collections + indexes + storage bucket (job-files) provisioned via Appwrite MCP

Ref: belgeler/dls-ui-tasarim.pdf

src/components/site-header.tsx

@@ -0,0 +1,47 @@
+"use client";
+
+import * as React from "react";
+import { Building2, Plus } from "lucide-react";
+import Link from "next/link";
+
+import { ModeToggle } from "@/components/mode-toggle";
+import { Button } from "@/components/ui/button";
+import { Separator } from "@/components/ui/separator";
+import { SidebarTrigger } from "@/components/ui/sidebar";
+
+import type { ShellCompany } from "@/app/(dashboard)/dashboard-shell";
+
+export function SiteHeader({ company }: { company?: ShellCompany }) {
+  const showNewJobCta = company?.kind === "clinic";
+
+  return (
+    <header className="flex h-(--header-height) shrink-0 items-center gap-2 border-b transition-[width,height] ease-linear group-has-data-[collapsible=icon]/sidebar-wrapper:h-(--header-height)">
+      <div className="flex w-full items-center gap-1 px-4 py-3 lg:gap-2 lg:px-6">
+        <SidebarTrigger className="-ml-1" />
+        <Separator
+          orientation="vertical"
+          className="mx-2 data-[orientation=vertical]:h-4"
+        />
+
+        {company && (
+          <div className="text-muted-foreground hidden items-center gap-1.5 text-sm md:flex">
+            <Building2 className="size-3.5" />
+            <span className="max-w-[260px] truncate">{company.name}</span>
+          </div>
+        )}
+
+        <div className="ml-auto flex items-center gap-2">
+          {showNewJobCta && (
+            <Button asChild size="sm">
+              <Link href="/jobs/new">
+                <Plus className="size-4" />
+                Yeni İş Yayınla
+              </Link>
+            </Button>
+          )}
+          <ModeToggle />
+        </div>
+      </div>
+    </header>
+  );
+}