Phase 3-4: Goals AI planner, Team tasks, Push notifications, i18n (CZ/HE/RU/UA)

- Goals CRUD API + AI study plan generator + progress reports
- Goals frontend page with progress bars
- Team tasks: assign, transfer, collaborate endpoints
- Push notifications: web-push, VAPID, subscribe/send
- i18n: 4 languages (cs, he, ru, ua) translation files
- notifications.js + goals.js routes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/package-lock.json

@@ -21,7 +21,8 @@
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         "pg": "^8.20.0",
         "redis": "^5.11.0",
-        "uuid": "^13.0.0"
+        "uuid": "^13.0.0",
+        "web-push": "^3.6.7"
       },
       "devDependencies": {
         "nodemon": "^3.1.14"
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       "license": "MIT"
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+    "node_modules/agent-base": {
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+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-7.1.4.tgz",
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+      "license": "MIT",
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       "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.18.0.tgz",
@@ -590,6 +600,12 @@
         "node": ">=8"
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+    "node_modules/buffer-equal-constant-time": {
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+      "resolved": "https://registry.npmjs.org/buffer-equal-constant-time/-/buffer-equal-constant-time-1.0.1.tgz",
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       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.6.0.tgz",
@@ -978,6 +994,15 @@
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+    "node_modules/http_ece": {
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+      "resolved": "https://registry.npmjs.org/http_ece/-/http_ece-1.2.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=16"
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@@ -998,6 +1023,19 @@
         "url": "https://opencollective.com/express"
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+    "node_modules/https-proxy-agent": {
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+      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-7.0.6.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "agent-base": "^7.1.2",
+        "debug": "4"
+      },
+      "engines": {
+        "node": ">= 14"
+      }
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     "node_modules/ignore-by-default": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/ignore-by-default/-/ignore-by-default-1.0.1.tgz",
@@ -1145,6 +1183,27 @@
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       "license": "MIT"
     },
+    "node_modules/jwa": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/jwa/-/jwa-2.0.1.tgz",
+      "integrity": "sha512-hRF04fqJIP8Abbkq5NKGN0Bbr3JxlQ+qhZufXVr0DvujKy93ZCbXZMHDL4EOtodSbCWxOqR8MS1tXA5hwqCXDg==",
+      "license": "MIT",
+      "dependencies": {
+        "buffer-equal-constant-time": "^1.0.1",
+        "ecdsa-sig-formatter": "1.0.11",
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "node_modules/jws": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/jws/-/jws-4.0.1.tgz",
+      "integrity": "sha512-EKI/M/yqPncGUUh44xz0PxSidXFr/+r0pA70+gIYhjv+et7yxM+s29Y+VGDkovRofQem0fs7Uvf4+YmAdyRduA==",
+      "license": "MIT",
+      "dependencies": {
+        "jwa": "^2.0.1",
+        "safe-buffer": "^5.0.1"
+      }
+    },
     "node_modules/light-my-request": {
       "version": "6.6.0",
       "resolved": "https://registry.npmjs.org/light-my-request/-/light-my-request-6.6.0.tgz",
@@ -1236,6 +1295,15 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/minimist": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.8.tgz",
+      "integrity": "sha512-2yyAR8qBkN3YuheJanUpWC5U3bb5osDywNB8RzDVlDwDHbocAJveqqj1u8+SVD7jkWT4yvsHCpWqqWqAxb0zCA==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/minipass": {
       "version": "7.1.3",
       "resolved": "https://registry.npmjs.org/minipass/-/minipass-7.1.3.tgz",
@@ -1905,6 +1973,25 @@
         "uuid": "dist-node/bin/uuid"
       }
     },
+    "node_modules/web-push": {
+      "version": "3.6.7",
+      "resolved": "https://registry.npmjs.org/web-push/-/web-push-3.6.7.tgz",
+      "integrity": "sha512-OpiIUe8cuGjrj3mMBFWY+e4MMIkW3SVT+7vEIjvD9kejGUypv8GPDf84JdPWskK8zMRIJ6xYGm+Kxr8YkPyA0A==",
+      "license": "MPL-2.0",
+      "dependencies": {
+        "asn1.js": "^5.3.0",
+        "http_ece": "1.2.0",
+        "https-proxy-agent": "^7.0.0",
+        "jws": "^4.0.0",
+        "minimist": "^1.2.5"
+      },
+      "bin": {
+        "web-push": "src/cli.js"
+      },
+      "engines": {
+        "node": ">= 16"
+      }
+    },
     "node_modules/xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",