phase-8g: rate limiting and update readme doc

package-lock.json

@@ -10,6 +10,7 @@
       "dependencies": {
         "@anthropic-ai/sdk": "^0.100.1",
         "@fastify/cors": "^11.2.0",
+        "@fastify/rate-limit": "^10.2.1",
         "dotenv": "^16.0.0",
         "fastify": "^5.8.5",
         "yahoo-finance2": "^3.15.2"
@@ -733,6 +734,27 @@
         "node": ">= 10"
       }
     },
+    "node_modules/@fastify/rate-limit": {
+      "version": "10.3.0",
+      "resolved": "https://registry.npmjs.org/@fastify/rate-limit/-/rate-limit-10.3.0.tgz",
+      "integrity": "sha512-eIGkG9XKQs0nyynatApA3EVrojHOuq4l6fhB4eeCk4PIOeadvOJz9/4w3vGI44Go17uaXOWEcPkaD8kuKm7g6Q==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@lukeed/ms": "^2.0.2",
+        "fastify-plugin": "^5.0.0",
+        "toad-cache": "^3.7.0"
+      }
+    },
     "node_modules/@hono/node-server": {
       "version": "1.19.14",
       "resolved": "https://registry.npmjs.org/@hono/node-server/-/node-server-1.19.14.tgz",
@@ -783,6 +805,15 @@
       "dev": true,
       "license": "BSD-3-Clause"
     },
+    "node_modules/@lukeed/ms": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@lukeed/ms/-/ms-2.0.2.tgz",
+      "integrity": "sha512-9I2Zn6+NJLfaGoz9jN3lpwDgAYvfGeNYdbAIjJOqzs4Tpc+VU3Jqq4IofSUBKajiDS8k9fZIg18/z13mpk1bsA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/@modelcontextprotocol/sdk": {
       "version": "1.29.0",
       "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.29.0.tgz",