Refactor project structure and update .gitignore; enhance README with setup instructions and environment requirements. Clean up backend code for improved readability and maintainability.

frontend/package-lock.json

@@ -999,7 +999,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "undici-types": "~7.16.0"
       }
@@ -1478,7 +1477,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.9.0",
         "caniuse-lite": "^1.0.30001759",
@@ -2110,7 +2108,6 @@
       "integrity": "sha512-/imKNG4EbWNrVjoNC/1H5/9GFy+tqjGBHCaSsN+P2RnPqjsLmv6UD3Ej+Kj8nBWaRAwyk7kK5ZUc+OEatnTR3A==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "jiti": "bin/jiti.js"
       }
@@ -2443,7 +2440,6 @@
       "resolved": "https://registry.npmjs.org/pinia/-/pinia-3.0.4.tgz",
       "integrity": "sha512-l7pqLUFTI/+ESXn6k3nu30ZIzW5E2WZF/LaHJEpoq6ElcLD+wduZoB2kBN19du6K/4FDpPMazY2wJr+IndBtQw==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@vue/devtools-api": "^7.7.7"
       },
@@ -2500,7 +2496,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "nanoid": "^3.3.11",
         "picocolors": "^1.1.1",
@@ -3056,7 +3051,6 @@
       "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
       "devOptional": true,
       "license": "Apache-2.0",
-      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -3152,7 +3146,6 @@
       "integrity": "sha512-w+N7Hifpc3gRjZ63vYBXA56dvvRlNWRczTdmCBBa+CotUzAPf5b7YMdMR/8CQoeYE5LX3W4wj6RYTgonm1b9DA==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "esbuild": "^0.27.0",
         "fdir": "^6.5.0",
@@ -3234,7 +3227,6 @@
       "resolved": "https://registry.npmjs.org/vue/-/vue-3.5.27.tgz",
       "integrity": "sha512-aJ/UtoEyFySPBGarREmN4z6qNKpbEguYHMmXSiOGk69czc+zhs0NF6tEFrY8TZKAl8N/LYAkd4JHVd5E/AsSmw==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@vue/compiler-dom": "3.5.27",
         "@vue/compiler-sfc": "3.5.27",