feat(pages): add gallery section to landing page templates

Add configurable gallery section that displays images from repository's .gallery folder on landing pages. Includes settings for enabled/disabled, headline, subheadline, max images (default 6), and grid columns (default 3). Reads captions from gallery.json metadata. Implements gallery rendering in all four page templates (bold-marketing, minimalist-docs, open-source-hero, saas-conversion). Integrates with existing gallery management feature.

modules/pages/config.go

@@ -47,6 +47,9 @@ type LandingConfig struct {
 	// Blog section
 	Blog BlogSectionConfig `yaml:"blog,omitempty"`
 
+	// Gallery section
+	Gallery GallerySectionConfig `yaml:"gallery,omitempty"`
+
 	// Navigation visibility
 	Navigation NavigationConfig `yaml:"navigation,omitempty"`
 
@@ -196,6 +199,15 @@ type BlogSectionConfig struct {
 	CTAButton   CTAButton `yaml:"cta_button,omitempty"`   // "View All Posts" link
 }
 
+// GallerySectionConfig represents gallery section settings on the landing page
+type GallerySectionConfig struct {
+	Enabled     bool   `yaml:"enabled,omitempty"`
+	Headline    string `yaml:"headline,omitempty"`
+	Subheadline string `yaml:"subheadline,omitempty"`
+	MaxImages   int    `yaml:"max_images,omitempty"` // default 6
+	Columns     int    `yaml:"columns,omitempty"`    // grid columns, default 3
+}
+
 // NavigationConfig controls which built-in navigation links appear in the header and footer
 type NavigationConfig struct {
 	ShowDocs       bool `yaml:"show_docs,omitempty"`