docs: add OpenAPI spec URLs to REST API description

Add a section documenting the OpenAPI specification endpoints
(/api/v1/openapi.json and /api/v1/openapi.yaml) in the API description.
This helps third-party tools discover and integrate with the API.

Bump version to 1.3.0 in all package.json files.

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

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

Author: oriolrius

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@pki-manager/backend",
-  "version": "1.1.2",
+  "version": "1.3.0",
   "private": true,
   "type": "module",
   "description": "PKI Manager Backend - Fastify + tRPC API server",

backend/src/rest/openapi.ts

@@ -15,6 +15,14 @@ export const swaggerOptions: FastifyDynamicSwaggerOptions = {
 This API provides RESTful endpoints for managing Certificate Authorities (CAs),
 certificates, Certificate Revocation Lists (CRLs), and related operations.
 
+## OpenAPI Specification
+
+The OpenAPI 3.1 specification is available at:
+- **JSON**: \`/api/v1/openapi.json\`
+- **YAML**: \`/api/v1/openapi.yaml\`
+
+Use these URLs to integrate with third-party tools, code generators, or API clients.
+
 ## Features
 - Certificate Authority management (create, revoke, delete)
 - Certificate lifecycle management (issue, renew, revoke, download)

frontend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "frontend",
   "private": true,
-  "version": "1.2.1",
+  "version": "1.3.0",
   "type": "module",
   "scripts": {
     "dev": "vite",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pki-manager",
-  "version": "1.2.1",
+  "version": "1.3.0",
   "private": true,
   "description": "PKI Manager - Web-based Public Key Infrastructure management application",
   "license": "Apache-2.0",