feat(package): remove langchain, other unused packages

package.json

@@ -14,26 +14,16 @@
     "@headlessui/react": "^2.2.0",
     "@headlessui/tailwindcss": "^0.2.2",
     "@huggingface/transformers": "^3.7.5",
-    "@iarna/toml": "^2.2.5",
     "@icons-pack/react-simple-icons": "^12.3.0",
-    "@langchain/anthropic": "^1.0.1",
-    "@langchain/community": "^1.0.3",
-    "@langchain/core": "^1.0.5",
-    "@langchain/google-genai": "^1.0.1",
-    "@langchain/groq": "^1.0.1",
-    "@langchain/langgraph": "^1.0.1",
-    "@langchain/ollama": "^1.0.1",
-    "@langchain/openai": "^1.1.1",
-    "@langchain/textsplitters": "^1.0.0",
     "@tailwindcss/typography": "^0.5.12",
+    "@types/jspdf": "^2.0.0",
     "axios": "^1.8.3",
     "better-sqlite3": "^11.9.1",
     "clsx": "^2.1.0",
     "drizzle-orm": "^0.40.1",
     "framer-motion": "^12.23.25",
-    "html-to-text": "^9.0.5",
-    "jspdf": "^3.0.1",
-    "langchain": "^1.0.4",
+    "js-tiktoken": "^1.0.21",
+    "jspdf": "^3.0.4",
     "lightweight-charts": "^5.0.9",
     "lucide-react": "^0.556.0",
     "mammoth": "^1.9.1",
@@ -41,10 +31,11 @@
     "mathjs": "^15.1.0",
     "next": "^16.0.7",
     "next-themes": "^0.3.0",
+    "officeparser": "^5.2.2",
     "ollama": "^0.6.3",
     "openai": "^6.9.0",
     "partial-json": "^0.1.7",
-    "pdf-parse": "^1.1.1",
+    "pdf-parse": "^2.4.5",
     "react": "^18",
     "react-dom": "^18",
     "react-text-to-speech": "^0.14.5",
@@ -53,15 +44,12 @@
     "sonner": "^1.4.41",
     "tailwind-merge": "^2.2.2",
     "turndown": "^7.2.2",
-    "winston": "^3.17.0",
     "yahoo-finance2": "^3.10.2",
     "yet-another-react-lightbox": "^3.17.2",
     "zod": "^4.1.12"
   },
   "devDependencies": {
     "@types/better-sqlite3": "^7.6.12",
-    "@types/html-to-text": "^9.0.4",
-    "@types/jspdf": "^2.0.0",
     "@types/node": "^24.8.1",
     "@types/pdf-parse": "^1.1.4",
     "@types/react": "^18",