feat(server): add owner-tools injection and inline code theme CSS

- Add owner-tools serving and injection for blog owners
- Inline code theme CSS in templates for soft reload support
- Update import paths from github.com/writekitapp to writekit
- Add optional session middleware for owner detection
- Update platform index with improved UI

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/server/studio.go

@@ -15,11 +15,11 @@ import (
 	"github.com/go-chi/chi/v5"
 	"github.com/google/uuid"
 	"github.com/gorilla/websocket"
-	"github.com/writekitapp/writekit/internal/config"
-	"github.com/writekitapp/writekit/internal/db"
-	"github.com/writekitapp/writekit/internal/imaginary"
-	"github.com/writekitapp/writekit/internal/markdown"
-	"github.com/writekitapp/writekit/internal/tenant"
+	"writekit/internal/config"
+	"writekit/internal/db"
+	"writekit/internal/imaginary"
+	"writekit/internal/markdown"
+	"writekit/internal/tenant"
 )
 
 func renderContent(q *tenant.Queries, r *http.Request, content string) string {
@@ -52,6 +52,7 @@ func (s *Server) studioRoutes() chi.Router {
 
 	r.Get("/settings", s.getSettings)
 	r.Put("/settings", s.updateSettings)
+	r.Get("/settings/schema", s.getSettingsSchema)
 
 	r.Get("/interaction-config", s.getStudioInteractionConfig)
 	r.Put("/interaction-config", s.updateInteractionConfig)
@@ -93,9 +94,8 @@ func (s *Server) studioRoutes() chi.Router {
 	r.Get("/sdk", s.getSDK)
 	r.Get("/lsp", s.proxyLSP)
 
-	// Code themes
+	// Code theme CSS
 	r.Get("/code-theme.css", s.codeThemeCSS)
-	r.Get("/code-themes", s.listCodeThemes)
 
 	// Plugin testing
 	r.Post("/plugins/test", s.testPlugin)
@@ -818,6 +818,89 @@ func (s *Server) updateSettings(w http.ResponseWriter, r *http.Request) {
 	jsonResponse(w, http.StatusOK, map[string]bool{"success": true})
 }
 
+type settingOption struct {
+	Value string `json:"value"`
+	Label string `json:"label"`
+}
+
+type settingDefinition struct {
+	Key     string          `json:"key"`
+	Type    string          `json:"type"`
+	Label   string          `json:"label"`
+	Options []settingOption `json:"options,omitempty"`
+	Default string          `json:"default,omitempty"`
+}
+
+func (s *Server) getSettingsSchema(w http.ResponseWriter, r *http.Request) {
+	schema := []settingDefinition{
+		{
+			Key:     "accent_color",
+			Type:    "color",
+			Label:   "Accent Color",
+			Default: "#10b981",
+		},
+		{
+			Key:   "font",
+			Type:  "select",
+			Label: "Font",
+			Options: []settingOption{
+				{Value: "system", Label: "System Default"},
+				{Value: "inter", Label: "Inter"},
+				{Value: "georgia", Label: "Georgia"},
+				{Value: "merriweather", Label: "Merriweather"},
+				{Value: "source-serif", Label: "Source Serif"},
+				{Value: "jetbrains-mono", Label: "JetBrains Mono"},
+			},
+			Default: "system",
+		},
+		{
+			Key:   "code_theme",
+			Type:  "select",
+			Label: "Code Theme",
+			Options: []settingOption{
+				{Value: "github", Label: "GitHub Light"},
+				{Value: "github-dark", Label: "GitHub Dark"},
+				{Value: "vs", Label: "VS Light"},
+				{Value: "xcode", Label: "Xcode Light"},
+				{Value: "xcode-dark", Label: "Xcode Dark"},
+				{Value: "solarized-light", Label: "Solarized Light"},
+				{Value: "solarized-dark", Label: "Solarized Dark"},
+				{Value: "gruvbox-light", Label: "Gruvbox Light"},
+				{Value: "gruvbox", Label: "Gruvbox Dark"},
+				{Value: "nord", Label: "Nord"},
+				{Value: "onedark", Label: "One Dark"},
+				{Value: "dracula", Label: "Dracula"},
+				{Value: "monokai", Label: "Monokai"},
+			},
+			Default: "github",
+		},
+		{
+			Key:   "layout",
+			Type:  "select",
+			Label: "Layout",
+			Options: []settingOption{
+				{Value: "default", Label: "Classic"},
+				{Value: "minimal", Label: "Minimal"},
+				{Value: "magazine", Label: "Magazine"},
+			},
+			Default: "default",
+		},
+		{
+			Key:   "compactness",
+			Type:  "select",
+			Label: "Density",
+			Options: []settingOption{
+				{Value: "compact", Label: "Compact"},
+				{Value: "cozy", Label: "Cozy"},
+				{Value: "spacious", Label: "Spacious"},
+			},
+			Default: "cozy",
+		},
+	}
+
+	jsonResponse(w, http.StatusOK, schema)
+}
+
 func (s *Server) listAssets(w http.ResponseWriter, r *http.Request) {
 	tenantID := r.Context().Value(tenantIDKey).(string)
 
@@ -1789,11 +1872,6 @@ func (s *Server) codeThemeCSS(w http.ResponseWriter, r *http.Request) {
 	w.Write([]byte(css))
 }
 
-func (s *Server) listCodeThemes(w http.ResponseWriter, r *http.Request) {
-	themes := markdown.ListThemes()
-	jsonResponse(w, http.StatusOK, themes)
-}
-
 func contains(slice []string, item string) bool {
 	for _, s := range slice {
 		if s == item {