Add OAuth 2.0 authentication support for Jira Data Center

- Add OAuth 2.0 configuration options in backend env.ts
- Create authService.ts for OAuth flow, token management, and sessions
- Create auth.ts routes for login, callback, logout, and user info
- Update JiraAssets service to use user tokens when OAuth is enabled
- Add cookie-parser for session handling
- Create Login.tsx component with Jira OAuth login button
- Add authStore.ts (Zustand) for frontend auth state management
- Update App.tsx to show login page when OAuth is enabled
- Add user menu with logout functionality
- Document OAuth setup in CLAUDE.md

Supports two modes:
1. Service Account: Uses JIRA_PAT for all requests (default)
2. OAuth 2.0: Each user authenticates with their Jira credentials

package-lock.json

@@ -21,6 +21,7 @@
       "dependencies": {
         "@anthropic-ai/sdk": "^0.32.1",
         "better-sqlite3": "^11.6.0",
+        "cookie-parser": "^1.4.7",
         "cors": "^2.8.5",
         "dotenv": "^16.4.5",
         "express": "^4.21.1",
@@ -32,6 +33,7 @@
       },
       "devDependencies": {
         "@types/better-sqlite3": "^7.6.12",
+        "@types/cookie-parser": "^1.4.10",
         "@types/cors": "^2.8.17",
         "@types/express": "^5.0.0",
         "@types/node": "^22.9.0",
@@ -1356,6 +1358,16 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/cookie-parser": {
+      "version": "1.4.10",
+      "resolved": "https://registry.npmjs.org/@types/cookie-parser/-/cookie-parser-1.4.10.tgz",
+      "integrity": "sha512-B4xqkqfZ8Wek+rCOeRxsjMS9OgvzebEzzLYw7NHYuvzb7IdxOkI0ZHGgeEBX4PUM7QGVvNSK60T3OvWj3YfBRg==",
+      "dev": true,
+      "license": "MIT",
+      "peerDependencies": {
+        "@types/express": "*"
+      }
+    },
     "node_modules/@types/cors": {
       "version": "2.8.19",
       "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.19.tgz",
@@ -2211,6 +2223,25 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/cookie-parser": {
+      "version": "1.4.7",
+      "resolved": "https://registry.npmjs.org/cookie-parser/-/cookie-parser-1.4.7.tgz",
+      "integrity": "sha512-nGUvgXnotP3BsjiLX2ypbQnWoGUPIIfHQNZkkC668ntrzGWEZVW70HDEB1qnNGMicPje6EttlIgzo51YSwNQGw==",
+      "license": "MIT",
+      "dependencies": {
+        "cookie": "0.7.2",
+        "cookie-signature": "1.0.6"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
+    "node_modules/cookie-parser/node_modules/cookie-signature": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
+      "integrity": "sha512-QADzlaHc8icV8I7vbaJXJwod9HWYp8uCqf1xa4OfNu1T7JVxQIrUgOWtHdNDtPiywmFbiS12VjotIXLrKM3orQ==",
+      "license": "MIT"
+    },
     "node_modules/cookie-signature": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.7.tgz",