chore: refresh dependencies, fix Linux tool tasks, modernize Go idioms

Frontend deps: @hookform/resolvers 5.4.0 -> 5.4.3 and react-hook-form
7.82.0 -> 7.83.0. The @typeschema/valibot override is what makes this
installable at all. Resolvers 5.4.3 re-declares 25 optional peers for its
validator matrix, and npm resolves them into the ideal tree even though none
are used here; two of them contradict, since resolvers wants valibot ^1 while
@typeschema/main -> @typeschema/valibot pins valibot ^0.39. Both target the
same node_modules/valibot, so a plain npm update dies with ERESOLVE. The
override settles that one edge and nothing extra lands in node_modules.

Backend deps: telego 1.10.0 -> 1.11.1 (Telegram Bot API v10.2, additive
only), klauspost/compress 1.19.1, plus the indirect bumps that came with them.

VS Code tasks: the golangci-lint and modernize tasks assumed Windows PATH
semantics, where PATH is a persistent user variable that every process
inherits, so ~/go/bin was always visible. On Linux that directory is exported
from ~/.bashrc, which the non-interactive `bash -c` behind a task never
sources, and both tasks failed with exit 127. Adds linux/osx option blocks
that prepend the Go bin directories and leaves the Windows path untouched,
plus tasks to install the two tools; those are split because go install
rejects packages from different modules in one invocation.

Go sources: modernize -fix output, covering range-over-int, slices.Backward,
maps.Copy, strings.CutPrefix and strings.SplitSeq. Behaviour is unchanged.

.vscode/tasks.json

@@ -96,6 +96,22 @@
       "options": {
         "cwd": "${workspaceFolder}"
       },
+      "linux": {
+        "options": {
+          "cwd": "${workspaceFolder}",
+          "env": {
+            "PATH": "${userHome}/go/bin:/usr/local/go/bin:${env:PATH}"
+          }
+        }
+      },
+      "osx": {
+        "options": {
+          "cwd": "${workspaceFolder}",
+          "env": {
+            "PATH": "${userHome}/go/bin:/usr/local/go/bin:${env:PATH}"
+          }
+        }
+      },
       "problemMatcher": [
         "$go"
       ]
@@ -111,6 +127,22 @@
       "options": {
         "cwd": "${workspaceFolder}"
       },
+      "linux": {
+        "options": {
+          "cwd": "${workspaceFolder}",
+          "env": {
+            "PATH": "${userHome}/go/bin:/usr/local/go/bin:${env:PATH}"
+          }
+        }
+      },
+      "osx": {
+        "options": {
+          "cwd": "${workspaceFolder}",
+          "env": {
+            "PATH": "${userHome}/go/bin:/usr/local/go/bin:${env:PATH}"
+          }
+        }
+      },
       "problemMatcher": [
         "$go"
       ]
@@ -125,6 +157,22 @@
       "options": {
         "cwd": "${workspaceFolder}"
       },
+      "linux": {
+        "options": {
+          "cwd": "${workspaceFolder}",
+          "env": {
+            "PATH": "${userHome}/go/bin:/usr/local/go/bin:${env:PATH}"
+          }
+        }
+      },
+      "osx": {
+        "options": {
+          "cwd": "${workspaceFolder}",
+          "env": {
+            "PATH": "${userHome}/go/bin:/usr/local/go/bin:${env:PATH}"
+          }
+        }
+      },
       "problemMatcher": [
         "$go"
       ]
@@ -140,10 +188,93 @@
       "options": {
         "cwd": "${workspaceFolder}"
       },
+      "linux": {
+        "options": {
+          "cwd": "${workspaceFolder}",
+          "env": {
+            "PATH": "${userHome}/go/bin:/usr/local/go/bin:${env:PATH}"
+          }
+        }
+      },
+      "osx": {
+        "options": {
+          "cwd": "${workspaceFolder}",
+          "env": {
+            "PATH": "${userHome}/go/bin:/usr/local/go/bin:${env:PATH}"
+          }
+        }
+      },
       "problemMatcher": [
         "$go"
       ]
     },
+    {
+      "label": "go: install golangci-lint",
+      "type": "shell",
+      "command": "go",
+      "args": [
+        "install",
+        "github.com/golangci/golangci-lint/v2/cmd/golangci-lint@latest"
+      ],
+      "options": {
+        "cwd": "${workspaceFolder}"
+      },
+      "linux": {
+        "options": {
+          "cwd": "${workspaceFolder}",
+          "env": {
+            "PATH": "${userHome}/go/bin:/usr/local/go/bin:${env:PATH}"
+          }
+        }
+      },
+      "osx": {
+        "options": {
+          "cwd": "${workspaceFolder}",
+          "env": {
+            "PATH": "${userHome}/go/bin:/usr/local/go/bin:${env:PATH}"
+          }
+        }
+      },
+      "problemMatcher": []
+    },
+    {
+      "label": "go: install modernize",
+      "type": "shell",
+      "command": "go",
+      "args": [
+        "install",
+        "golang.org/x/tools/gopls/internal/analysis/modernize/cmd/modernize@latest"
+      ],
+      "options": {
+        "cwd": "${workspaceFolder}"
+      },
+      "linux": {
+        "options": {
+          "cwd": "${workspaceFolder}",
+          "env": {
+            "PATH": "${userHome}/go/bin:/usr/local/go/bin:${env:PATH}"
+          }
+        }
+      },
+      "osx": {
+        "options": {
+          "cwd": "${workspaceFolder}",
+          "env": {
+            "PATH": "${userHome}/go/bin:/usr/local/go/bin:${env:PATH}"
+          }
+        }
+      },
+      "problemMatcher": []
+    },
+    {
+      "label": "go: install tools",
+      "dependsOrder": "sequence",
+      "dependsOn": [
+        "go: install golangci-lint",
+        "go: install modernize"
+      ],
+      "problemMatcher": []
+    },
     {
       "label": "frontend: ncu -u",
       "type": "shell",