feat: add shared readme types

Author: Flo0806

shared/types/index.ts

@@ -1,3 +1,4 @@
 export * from './npm-registry'
 export * from './jsr'
 export * from './osv'
+export * from './readme'

shared/types/readme.ts

@@ -0,0 +1,23 @@
+/**
+ * Playground/demo link extracted from README
+ */
+export interface PlaygroundLink {
+  /** The full URL */
+  url: string
+  /** Provider identifier (e.g., 'stackblitz', 'codesandbox') */
+  provider: string
+  /** Human-readable provider name (e.g., 'StackBlitz', 'CodeSandbox') */
+  providerName: string
+  /** Link text from README (e.g., 'Demo', 'Try it online') */
+  label: string
+}
+
+/**
+ * Response from README API endpoint
+ */
+export interface ReadmeResponse {
+  /** Rendered HTML content */
+  html: string
+  /** Extracted playground/demo links */
+  playgroundLinks: PlaygroundLink[]
+}