LINUS ROUND 1: Delete dead code (rust/c), generic Store[T], tests, slim main.go

- Removed rust-service/, c-runtime/, kafka stubs
- Generic Store[T] pattern with real tests
- Slimmed main.go from 324 to ~50 lines
- Added config, middleware, store, ledger, pdf tests
- Frontend SPA shell with router
- Binary: 15.5MB -> 12MB

web/assets/modules/crm.js

@@ -0,0 +1,41 @@
+// CRM module
+export async function render(container) {
+  container.innerHTML = `
+    <header class="module-header">
+      <h1>CRM</h1>
+      <p class="subtitle">Kunder och leads</p>
+    </header>
+    <div class="toolbar">
+      <button class="btn-primary" id="btn-new-customer">+ Ny kund</button>
+    </div>
+    <div class="table-container">
+      <table class="data-table" id="customers-table">
+        <thead>
+          <tr><th>Namn</th><th>Företag</th><th>Status</th><th>Email</th></tr>
+        </thead>
+        <tbody></tbody>
+      </table>
+    </div>
+  `;
+
+  try {
+    const res = await apiRequest('/crm/customers');
+    const data = await res.json();
+    const tbody = container.querySelector('#customers-table tbody');
+
+    if (data.customers?.length) {
+      tbody.innerHTML = data.customers.map(c => `
+        <tr>
+          <td>${c.name}</td>
+          <td>${c.company || '-'}</td>
+          <td><span class="badge badge-${c.status}">${c.status}</span></td>
+          <td>${c.email || '-'}</td>
+        </tr>
+      `).join('');
+    } else {
+      tbody.innerHTML = '<tr><td colspan="4">Inga kunder hittades</td></tr>';
+    }
+  } catch (err) {
+    container.innerHTML += `<div class="alert alert-error">Kunde inte ladda kunder: ${err.message}</div>`;
+  }
+}