feat: Web 版独立入口 + SQLite 持久化存储

- 拆分 main.go 为 main_cli.go 和 main_web.go，Web 版不再包含 CLI 参数解析
- Web 版直接启动 HTTP 服务，通过 -port/-lang 控制，无需 -web flag
- 结果存储从内存 map 替换为 SQLite（modernc.org/sqlite，纯 Go 零 CGO）
- 数据库文件 ~/.fscan/results.db，进程重启后结果不丢失
- 修复结果分布面板跟随 tab 筛选联动的问题

web-ui/package-lock.json

@@ -21,6 +21,7 @@
         "@radix-ui/react-switch": "^1.2.6",
         "@radix-ui/react-tabs": "^1.1.13",
         "@radix-ui/react-tooltip": "^1.2.8",
+        "@rollup/rollup-linux-x64-gnu": "^4.61.1",
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
         "i18next": "^25.7.3",
@@ -2496,15 +2497,16 @@
       ]
     },
     "node_modules/@rollup/rollup-linux-x64-gnu": {
-      "version": "4.54.0",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-x64-gnu/-/rollup-linux-x64-gnu-4.54.0.tgz",
-      "integrity": "sha512-WGt5J8Ij/rvyqpFexxk3ffKqqbLf9AqrTBbWDk7ApGUzaIs6V+s2s84kAxklFwmMF/vBNGrVdYgbblCOFFezMQ==",
+      "version": "4.61.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-x64-gnu/-/rollup-linux-x64-gnu-4.61.1.tgz",
+      "integrity": "sha512-bVWIOIk6pV01p4CdUbPP7CJ/434z+OooYjDuFcR+44N35YvKUC66G8MGnvcWx5mWKW3g61J+t74l3Kj15Kwn2Q==",
       "cpu": [
         "x64"
       ],
-      "dev": true,
+      "libc": [
+        "glibc"
+      ],
       "license": "MIT",
-      "optional": true,
       "os": [
         "linux"
       ]
@@ -5318,6 +5320,23 @@
         "fsevents": "~2.3.2"
       }
     },
+    "node_modules/rollup/node_modules/@rollup/rollup-linux-x64-gnu": {
+      "version": "4.54.0",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-x64-gnu/-/rollup-linux-x64-gnu-4.54.0.tgz",
+      "integrity": "sha512-WGt5J8Ij/rvyqpFexxk3ffKqqbLf9AqrTBbWDk7ApGUzaIs6V+s2s84kAxklFwmMF/vBNGrVdYgbblCOFFezMQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "libc": [
+        "glibc"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
     "node_modules/run-parallel": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.2.0.tgz",