feat(pages): add A/B testing framework for landing pages

Implement comprehensive A/B testing system for landing page optimization:
- Database models for experiments, variants, and events
- AI-powered variant generation and analysis
- Visitor tracking with conversion metrics
- Experiment lifecycle management (draft/active/paused/completed)
- Email notifications for experiment results
- Cron job for automated experiment monitoring
- UI for viewing experiment results and statistics

modules/ai/client.go

@@ -213,6 +213,20 @@ func (c *Client) InspectWorkflow(ctx context.Context, req *InspectWorkflowReques
 	return resp, nil
 }
 
+// ExecuteTask executes a generic AI task via the sidecar
+func (c *Client) ExecuteTask(ctx context.Context, req *ExecuteTaskRequest) (*ExecuteTaskResponse, error) {
+	if !IsEnabled() {
+		return nil, errors.New("AI service is not enabled")
+	}
+
+	var resp ExecuteTaskResponse
+	if err := c.doRequest(ctx, http.MethodPost, "/execute-task", req, &resp); err != nil {
+		log.Error("AI ExecuteTask failed: %v", err)
+		return nil, err
+	}
+	return &resp, nil
+}
+
 // CheckHealth checks the health of the AI service
 func (c *Client) CheckHealth(ctx context.Context) (*HealthCheckResponse, error) {
 	var resp HealthCheckResponse

modules/ai/types.go

@@ -258,6 +258,22 @@ type InspectWorkflowResponse struct {
 	OutputTokens int             `json:"output_tokens"`
 }
 
+// ExecuteTaskRequest is the request for executing a generic AI task
+type ExecuteTaskRequest struct {
+	ProviderConfig *ProviderConfig   `json:"provider_config,omitempty"`
+	RepoID         int64             `json:"repo_id"`
+	Task           string            `json:"task"`
+	Context        map[string]string `json:"context"`
+	AllowedTools   []string          `json:"allowed_tools,omitempty"`
+}
+
+// ExecuteTaskResponse is the response from executing a generic AI task
+type ExecuteTaskResponse struct {
+	Success bool   `json:"success"`
+	Result  string `json:"result"`
+	Error   string `json:"error,omitempty"`
+}
+
 // HealthCheckResponse is the response from a health check
 type HealthCheckResponse struct {
 	Healthy        bool              `json:"healthy"`

modules/pages/config.go

@@ -47,6 +47,9 @@ type LandingConfig struct {
 	// Blog section
 	Blog BlogSectionConfig `yaml:"blog,omitempty"`
 
+	// Navigation visibility
+	Navigation NavigationConfig `yaml:"navigation,omitempty"`
+
 	// Footer
 	Footer FooterConfig `yaml:"footer,omitempty"`
 
@@ -61,6 +64,9 @@ type LandingConfig struct {
 
 	// Advanced settings
 	Advanced AdvancedConfig `yaml:"advanced,omitempty"`
+
+	// A/B testing experiments
+	Experiments ExperimentConfig `yaml:"experiments,omitempty"`
 }
 
 // BrandConfig represents brand/identity settings
@@ -69,6 +75,7 @@ type BrandConfig struct {
 	LogoURL    string `yaml:"logo_url,omitempty"`
 	LogoSource string `yaml:"logo_source,omitempty"` // "url" (default), "repo", or "org" — selects avatar source
 	Tagline    string `yaml:"tagline,omitempty"`
+	FaviconURL string `yaml:"favicon_url,omitempty"`
 }
 
 // HeroConfig represents hero section settings
@@ -159,6 +166,15 @@ type BlogSectionConfig struct {
 	CTAButton   CTAButton `yaml:"cta_button,omitempty"`   // "View All Posts" link
 }
 
+// NavigationConfig controls which built-in navigation links appear in the header and footer
+type NavigationConfig struct {
+	ShowDocs       bool `yaml:"show_docs,omitempty"`
+	ShowAPI        bool `yaml:"show_api,omitempty"`
+	ShowRepository bool `yaml:"show_repository,omitempty"`
+	ShowReleases   bool `yaml:"show_releases,omitempty"`
+	ShowIssues     bool `yaml:"show_issues,omitempty"`
+}
+
 // FooterConfig represents footer settings
 type FooterConfig struct {
 	Links         []FooterLink `yaml:"links,omitempty"`
@@ -209,6 +225,14 @@ type UmamiConfig struct {
 	URL       string `yaml:"url,omitempty"`
 }
 
+// ExperimentConfig represents A/B testing experiment settings
+type ExperimentConfig struct {
+	Enabled          bool `yaml:"enabled,omitempty"`
+	AutoOptimize     bool `yaml:"auto_optimize,omitempty"`
+	MinImpressions   int  `yaml:"min_impressions,omitempty"`
+	ApprovalRequired bool `yaml:"approval_required,omitempty"`
+}
+
 // AdvancedConfig represents advanced settings
 type AdvancedConfig struct {
 	CustomCSS      string            `yaml:"custom_css,omitempty"`
@@ -272,6 +296,11 @@ func DefaultConfig() *LandingConfig {
 			{Title: "Flexible", Description: "Adapts to your workflow, not the other way around.", Icon: "gear"},
 			{Title: "Open Source", Description: "Free forever. Community driven.", Icon: "heart"},
 		},
+		Navigation: NavigationConfig{
+			ShowDocs:       true,
+			ShowRepository: true,
+			ShowReleases:   true,
+		},
 		CTASection: CTASectionConfig{
 			Headline:    "Ready to get started?",
 			Subheadline: "Join thousands of developers already using this project.",