Fnos packaging (#2524)

* feat(packaging): add fnOS FPK packaging and CI workflow

Add packaging/fnos/ shell (manifest, lifecycle cmd scripts, install/
upgrade/uninstall wizards, desktop entry, EULA) plus in-repo build
script. A release now auto-builds langbot-<tag>-fnos.fpk via
.github/workflows/build-fnos-fpk.yaml, uploaded to the release assets.

* ci(fnos): skip release upload on manual dispatch

github.event.release.tag_name is empty when triggered via
workflow_dispatch, causing 'gh release upload' to fail with
'requires at least 2 arg(s)'. Restrict the step to release events.

* ci(fnos): normalize release asset name

Strip a trailing -fnos from the tag-derived version before appending
the suffix, avoiding langbot-<v>-fnos-fnos.fpk when the tag itself
already carries -fnos.

* ci(fnos): use release tag version for auto build, manifest for manual

Auto build (release/tag) reads version from tag like other release
workflows; build.sh strips the v prefix when injecting into manifest.
Manual dispatch falls back to the version maintained in manifest.

* feat(fnos): add post-install deployment notice to install wizard

Last wizard step now informs users that first startup takes about
5-10 minutes for dependency setup before the web UI is ready.

* docs(fnos): add packaging directory README

* refactor(fnos): rename app from ai.langbot to langbot

Rename appname, desktop entry, data share, build artifacts, and all
references from ai.langbot to langbot across packaging files.

---------

Co-authored-by: dadachann <185672915+dadachann@users.noreply.github.com>

packaging/fnos/wizard/install

@@ -0,0 +1,47 @@
+[
+    {
+        "stepTitle": "运行环境",
+        "items": [
+            {
+                "type": "tips",
+                "helpText": "LangBot 依赖 Node.js v22 运行 Box 沙箱和 npx MCP。请先在应用中心安装 Node.js v22。"
+            },
+            {
+                "type": "select",
+                "field": "wizard_node_version",
+                "label": "Node.js 版本",
+                "initValue": "22",
+                "options": [
+                    { "label": "Node.js v22 (推荐, LTS)", "value": "22" },
+                    { "label": "Node.js v24", "value": "24" },
+                    { "label": "Node.js v20", "value": "20" }
+                ]
+            }
+        ]
+    },
+    {
+        "stepTitle": "访问配置",
+        "items": [
+            {
+                "type": "text",
+                "field": "wizard_port",
+                "label": "Web 访问端口",
+                "initValue": "5300",
+                "rules": [
+                    { "required": true, "message": "请输入访问端口" },
+                    { "pattern": "^[0-9]+$", "message": "端口只能是数字" },
+                    { "min": 1, "max": 5, "message": "端口号长度不正确" }
+                ]
+            }
+        ]
+    },
+    {
+        "stepTitle": "安装说明",
+        "items": [
+            {
+                "type": "tips",
+                "helpText": "安装完成后，LangBot 首次启动约需 5-10 分钟完成依赖部署与初始化，部署完成后即可打开网页端使用。"
+            }
+        ]
+    }
+]

packaging/fnos/wizard/uninstall

@@ -0,0 +1,17 @@
+[
+    {
+        "stepTitle": "数据保留",
+        "items": [
+            {
+                "type": "radio",
+                "field": "wizard_keep_data",
+                "label": "是否保留 LangBot 数据（插件、配置、日志）",
+                "initValue": "yes",
+                "options": [
+                    { "label": "保留数据（重新安装后可继续使用）", "value": "yes" },
+                    { "label": "彻底删除全部数据", "value": "no" }
+                ]
+            }
+        ]
+    }
+]

packaging/fnos/wizard/upgrade

@@ -0,0 +1,38 @@
+[
+    {
+        "stepTitle": "运行环境",
+        "items": [
+            {
+                "type": "tips",
+                "helpText": "LangBot 依赖 Node.js v22 运行 Box 沙箱和 npx MCP。如需更换版本，请先在应用中心安装对应版本。"
+            },
+            {
+                "type": "select",
+                "field": "wizard_node_version",
+                "label": "Node.js 版本",
+                "initValue": "22",
+                "options": [
+                    { "label": "Node.js v22 (推荐, LTS)", "value": "22" },
+                    { "label": "Node.js v24", "value": "24" },
+                    { "label": "Node.js v20", "value": "20" }
+                ]
+            }
+        ]
+    },
+    {
+        "stepTitle": "访问配置",
+        "items": [
+            {
+                "type": "text",
+                "field": "wizard_port",
+                "label": "Web 访问端口",
+                "initValue": "5300",
+                "rules": [
+                    { "required": true, "message": "请输入访问端口" },
+                    { "pattern": "^[0-9]+$", "message": "端口只能是数字" },
+                    { "min": 1, "max": 5, "message": "端口号长度不正确" }
+                ]
+            }
+        ]
+    }
+]