feat: enhance Appwrite integration and chat functionality

- Added support for encrypted coach chats with a new `coach_chats` collection in the Appwrite database.
- Updated `.env.example` to include `OLLAMA_API_KEY`, `OLLAMA_MODEL`, and `APPWRITE_API_KEY` for server-side configurations.
- Introduced a setup script in `package.json` for initializing Appwrite database tables.
- Enhanced the Vite configuration to proxy requests to the Ollama API.
- Updated the main application structure to accommodate new chat features and improved theme management.
- Refined CSS styles for better UI consistency and added new components for chat functionality.

vite.config.ts

@@ -1,18 +1,44 @@
-import { defineConfig } from "vite";
 import react from "@vitejs/plugin-react";
+import { defineConfig, loadEnv } from "vite";
 
-export default defineConfig({
-  plugins: [react()],
-  build: {
-    chunkSizeWarningLimit: 700,
-    rollupOptions: {
-      output: {
-        manualChunks: {
-          charts: ["recharts"],
-          motion: ["framer-motion"],
-          icons: ["lucide-react"],
+export default defineConfig(({ mode }) => {
+  const env = loadEnv(mode, process.cwd(), "");
+  const ollamaProxy = {
+    target: "https://ollama.com",
+    changeOrigin: true,
+    rewrite: () => "/api/chat",
+    configure(proxy: { on: (event: "proxyReq", handler: (proxyReq: { setHeader: (name: string, value: string) => void }) => void) => void }) {
+      proxy.on("proxyReq", (proxyReq) => {
+        if (env.OLLAMA_API_KEY) {
+          proxyReq.setHeader("Authorization", `Bearer ${env.OLLAMA_API_KEY}`);
+        }
+      });
+    },
+  };
+
+  return {
+    plugins: [react()],
+    server: {
+      proxy: {
+        "/api/ollama-chat": ollamaProxy,
+      },
+    },
+    preview: {
+      proxy: {
+        "/api/ollama-chat": ollamaProxy,
+      },
+    },
+    build: {
+      chunkSizeWarningLimit: 700,
+      rollupOptions: {
+        output: {
+          manualChunks: {
+            charts: ["recharts"],
+            motion: ["framer-motion"],
+            icons: ["lucide-react"],
+          },
         },
       },
     },
-  },
+  };
 });