Add landing pages library with comprehensive components and demos

🤖 Generated with [Claude Code](https://claude.ai/code)

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

projects/ui-landing-pages/src/lib/interfaces/templates.interfaces.ts

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+import { HeroConfig } from './hero.interfaces';
+import { FeatureGridConfig } from './feature.interfaces';
+import { TestimonialCarouselConfig, StatisticsConfig } from './social-proof.interfaces';
+import { PricingTableConfig, CTASectionConfig } from './conversion.interfaces';
+import { LandingHeaderConfig, FooterConfig } from './navigation.interfaces';
+import { FAQConfig, TeamConfig, TimelineConfig } from './content.interfaces';
+
+export interface LandingPageSection {
+  id: string;
+  component: string;
+  configuration: any;
+  visible?: boolean;
+  order?: number;
+}
+
+export interface LandingPageTemplate {
+  id: string;
+  name: string;
+  description: string;
+  type: 'saas' | 'product' | 'agency' | 'custom';
+  sections: LandingPageSection[];
+  theme?: 'light' | 'dark' | 'gradient';
+  metadata?: {
+    title?: string;
+    description?: string;
+    keywords?: string[];
+    author?: string;
+  };
+}
+
+// Pre-configured template interfaces
+export interface SaaSTemplateConfig {
+  hero: HeroConfig;
+  features: FeatureGridConfig;
+  socialProof: StatisticsConfig;
+  pricing: PricingTableConfig;
+  testimonials: TestimonialCarouselConfig;
+  faq: FAQConfig;
+  cta: CTASectionConfig;
+  header?: LandingHeaderConfig;
+  footer?: FooterConfig;
+}
+
+export interface ProductTemplateConfig {
+  hero: HeroConfig;
+  features: FeatureGridConfig;
+  testimonials: TestimonialCarouselConfig;
+  pricing: PricingTableConfig;
+  cta: CTASectionConfig;
+  header?: LandingHeaderConfig;
+  footer?: FooterConfig;
+}
+
+export interface AgencyTemplateConfig {
+  hero: HeroConfig;
+  services: FeatureGridConfig;
+  team: TeamConfig;
+  timeline: TimelineConfig;
+  testimonials: TestimonialCarouselConfig;
+  cta: CTASectionConfig;
+  header?: LandingHeaderConfig;
+  footer?: FooterConfig;
+}