Add a basic Remote Assistance page (#5)

This PR implements the Remote Assistance page (which was previously just
a placeholder in the app) to provide an easy GUI for making a machine
join a Tailscale network via a device auth key. This PR is only a
minimal functional prototype of the UX as specified in
https://www.notion.so/DN-9-Tailscale-based-remote-assistance-system-in-ImSwitch-OS-2854e612c78a80038d5ac7d99da32698?source=copy_link;
if we want to more thoroughly stop Tailscale when disabling remote
assistance (which would involve interacting with systemd to manage
`tailscaled.service`), that should be done in a future PR.

This work is tracked on Notion at
https://www.notion.so/Provide-a-GUI-for-toggling-remote-assistance-2864e612c78a80c782e8e15e2f32a463?source=copy_link

Author: ethanjli

go.mod

@@ -1,19 +1,20 @@
 module github.com/openUC2/device-admin
 
-go 1.25.1
+go 1.25.3
 
 require (
 	github.com/Masterminds/sprig/v3 v3.3.0
 	github.com/benbjohnson/hashfs v0.2.2
 	github.com/dgraph-io/ristretto v0.2.0
-	github.com/godbus/dbus/v5 v5.1.0
+	github.com/godbus/dbus/v5 v5.1.1-0.20230522191255-76236955d466
 	github.com/google/uuid v1.6.0
 	github.com/labstack/echo/v4 v4.13.4
 	github.com/labstack/gommon v0.4.2
 	github.com/pkg/errors v0.9.1
 	github.com/sargassum-world/godest v0.6.1
 	github.com/unrolled/secure v1.17.0
 	golang.org/x/sync v0.17.0
+	tailscale.com v1.90.4
 )
 
 require (
@@ -35,6 +36,7 @@ require (
 	dario.cat/mergo v1.0.2 // indirect
 	dev.gaijin.team/go/exhaustruct/v4 v4.0.0 // indirect
 	dev.gaijin.team/go/golib v0.6.0 // indirect
+	filippo.io/edwards25519 v1.1.0 // indirect
 	github.com/42wim/httpsig v1.2.3 // indirect
 	github.com/4meepo/tagalign v1.4.3 // indirect
 	github.com/Abirdcfly/dupword v0.1.6 // indirect
@@ -73,6 +75,7 @@ require (
 	github.com/OpenPeeDeeP/depguard/v2 v2.2.1 // indirect
 	github.com/ProtonMail/go-crypto v1.3.0 // indirect
 	github.com/agnivade/levenshtein v1.2.1 // indirect
+	github.com/akutz/memconn v0.1.0 // indirect
 	github.com/alecthomas/chroma/v2 v2.20.0 // indirect
 	github.com/alecthomas/go-check-sumtype v0.3.1 // indirect
 	github.com/alexkohler/nakedret/v2 v2.0.6 // indirect
@@ -157,6 +160,7 @@ require (
 	github.com/client9/misspell v0.3.4 // indirect
 	github.com/cloudflare/circl v1.6.1 // indirect
 	github.com/cncf/xds/go v0.0.0-20250501225837-2ac532fd4443 // indirect
+	github.com/coder/websocket v1.8.12 // indirect
 	github.com/containerd/errdefs v1.0.0 // indirect
 	github.com/containerd/errdefs/pkg v0.3.0 // indirect
 	github.com/containerd/stargz-snapshotter/estargz v0.16.3 // indirect
@@ -168,6 +172,7 @@ require (
 	github.com/dave/dst v0.27.3 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/davidmz/go-pageant v1.0.2 // indirect
+	github.com/dblohm7/wingoes v0.0.0-20240119213807-a09d6be7affa // indirect
 	github.com/denis-tingaikin/go-header v0.5.0 // indirect
 	github.com/dghubble/go-twitter v0.0.0-20211115160449-93a8679adecb // indirect
 	github.com/dghubble/oauth1 v0.7.3 // indirect
@@ -195,6 +200,7 @@ require (
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/firefart/nonamedreturns v1.0.6 // indirect
 	github.com/fsnotify/fsnotify v1.9.0 // indirect
+	github.com/fxamacker/cbor/v2 v2.7.0 // indirect
 	github.com/fzipp/gocyclo v0.6.0 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.8 // indirect
 	github.com/ghostiam/protogetter v0.3.16 // indirect
@@ -206,6 +212,7 @@ require (
 	github.com/go-git/go-billy/v5 v5.6.2 // indirect
 	github.com/go-git/go-git/v5 v5.16.1 // indirect
 	github.com/go-jose/go-jose/v4 v4.1.0 // indirect
+	github.com/go-json-experiment/json v0.0.0-20250813024750-ebf49471dced // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-openapi/analysis v0.23.0 // indirect
@@ -277,6 +284,7 @@ require (
 	github.com/hashicorp/go-version v1.7.0 // indirect
 	github.com/hashicorp/golang-lru v1.0.2 // indirect
 	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
+	github.com/hdevalence/ed25519consensus v0.2.0 // indirect
 	github.com/hexops/gotextdiff v1.0.3 // indirect
 	github.com/huandu/xstrings v1.5.0 // indirect
 	github.com/in-toto/attestation v1.1.1 // indirect
@@ -303,6 +311,7 @@ require (
 	github.com/jjti/go-spancheck v0.6.5 // indirect
 	github.com/jmespath/go-jmespath v0.4.1-0.20220621161143-b0104c826a24 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
+	github.com/jsimonetti/rtnetlink v1.4.0 // indirect
 	github.com/julz/importas v0.2.0 // indirect
 	github.com/karamaru-alpha/copyloopvar v1.2.1 // indirect
 	github.com/kevinburke/ssh_config v1.2.0 // indirect
@@ -336,10 +345,13 @@ require (
 	github.com/mattn/go-localereader v0.0.2-0.20220822084749-2491eb6c1c75 // indirect
 	github.com/mattn/go-mastodon v0.0.10 // indirect
 	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/mdlayher/netlink v1.7.3-0.20250113171957-fbb4dce95f42 // indirect
+	github.com/mdlayher/socket v0.5.0 // indirect
 	github.com/mgechev/revive v1.12.0 // indirect
 	github.com/minio/sha256-simd v1.0.1 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
+	github.com/mitchellh/go-ps v1.0.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.1-0.20231216201459-8508981c8b6c // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/moby/docker-image-spec v1.3.1 // indirect
@@ -427,6 +439,7 @@ require (
 	github.com/stretchr/objx v0.5.2 // indirect
 	github.com/stretchr/testify v1.11.1 // indirect
 	github.com/subosito/gotenv v1.6.0 // indirect
+	github.com/tailscale/go-winio v0.0.0-20231025203758-c4f33415bf55 // indirect
 	github.com/tetafro/godot v1.5.4 // indirect
 	github.com/theupdateframework/go-tuf v0.7.0 // indirect
 	github.com/theupdateframework/go-tuf/v2 v2.0.2 // indirect
@@ -452,6 +465,7 @@ require (
 	github.com/wagoodman/go-progress v0.0.0-20220614130704-4b1c25a33c7c // indirect
 	github.com/whyrusleeping/cbor-gen v0.1.3-0.20240731173018-74d74643234c // indirect
 	github.com/wk8/go-ordered-map/v2 v2.1.8 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
 	github.com/xanzy/ssh-agent v0.3.3 // indirect
 	github.com/xen0n/gosmopolitan v1.3.0 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
@@ -483,6 +497,8 @@ require (
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.27.0 // indirect
 	go.yaml.in/yaml/v2 v2.4.2 // indirect
+	go4.org/mem v0.0.0-20240501181205-ae6ca9944745 // indirect
+	go4.org/netipx v0.0.0-20231129151722-fdeea329fbba // indirect
 	gocloud.dev v0.42.0 // indirect
 	golang.org/x/crypto v0.42.0 // indirect
 	golang.org/x/exp v0.0.0-20250620022241-b7579e27df2b // indirect
@@ -496,6 +512,7 @@ require (
 	golang.org/x/time v0.12.0 // indirect
 	golang.org/x/tools v0.37.0 // indirect
 	golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da // indirect
+	golang.zx2c4.com/wireguard/windows v0.5.3 // indirect
 	google.golang.org/api v0.246.0 // indirect
 	google.golang.org/genproto v0.0.0-20250603155806-513f23925822 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20250721164621-a45f3dfb1074 // indirect