Revert generalPartners, fix shareCapital: neither is a Pflichtangabe

Corrected after user feedback: Stammkapital/Grundkapital is only required on business correspondence if voluntarily disclosed in the first place (§35a Abs. 1 S. 2 GmbHG) — not an unconditional Pflichtangabe. shareCapital's Impressum rendering stays (shown only if an admin voluntarily filled it in), but it's dropped from the email/invoice footer.

generalPartners is removed entirely — the legal basis was genuinely unclear on research (§125a HGB's Geschäftsbriefe-naming duty only applies to the narrow case where no partner is a natural person; whether §5 DDG's Impressum-specific "vertretungsberechtigte Person" requirement independently mandates it for the general OHG/KG case wasn't resolved with confidence) — reverted rather than shipped on an uncertain legal basis.

Also fixes stale "§5 TMG" citations to "§5 DDG" (TMG was replaced 14 May 2024).

app/impressum/page.tsx

@@ -12,7 +12,7 @@ import { AnbieterAngaben, anbieterAngabenHeadings } from "./components/AnbieterA
 
 export const metadata: Metadata = {
   title: "Impressum",
-  description: "Angaben gemäß § 5 TMG für einfach produktiv.",
+  description: "Angaben gemäß § 5 DDG für einfach produktiv.",
   alternates: { canonical: "/impressum" },
 };
 
@@ -39,7 +39,7 @@ export default async function ImpressumPage() {
           >
             Impressum
           </p>
-          <p className="text-body text-text-muted">Angaben gemäß § 5 TMG</p>
+          <p className="text-body text-text-muted">Angaben gemäß § 5 DDG</p>
         </Reveal>
 
         <div className="flex flex-col lg:flex-row gap-8 lg:gap-12 items-start pb-16 pt-2 px-[var(--layout-padding-x)] w-full">