Don't depend on Node anymore (#346)

## Summary
- package `packages/server` as a standalone desktop executable so
Electron and Tauri no longer depend on a system-installed Node runtime
in production
- align Electron and Tauri startup logic around launching the packaged
server, resolving binaries from the user shell, and bundling the same
server resources into both desktop apps
- replace the workspace instance proxy path that used
`@fastify/reply-from` with a direct streaming proxy so packaged
standalone builds can talk to spawned `opencode` instances correctly

## Why
Desktop production builds were still depending on a user-provided Node
runtime to launch `packages/server`, which made packaging less
self-contained and created different behavior across machines. While
moving to a standalone server executable, we also found that
Bun-compiled standalone builds could start `opencode` successfully but
failed when proxying requests to those instances through `reply-from`.

The goal of this change is to make desktop production startup
self-contained, keep Electron and Tauri behavior aligned, and restore
correct communication with local `opencode` instances in packaged
builds.

## What Changed
- added a standalone build path for `packages/server` and bundle
`codenomad-server` into desktop resources
- updated Electron production startup to resolve and launch the
standalone server executable
- updated Tauri production startup to resolve and launch the standalone
server executable with matching cwd and shell behavior
- added runtime path helpers so the packaged server can reliably find
its bundled UI, auth templates, config template, and package metadata
- improved bare binary resolution so commands like `opencode` can be
resolved from the user's login shell environment
- upgraded the server stack to newer Fastify-compatible packages needed
for the standalone/runtime work
- replaced the workspace instance proxy implementation with a direct
streaming proxy for requests to spawned `opencode` instances
- updated Electron and Tauri build/prebuild scripts to generate and
package the standalone server, while also repairing missing
platform-specific optional binaries during packaging

## Benefits
- desktop production builds no longer require Node to be installed on
the user's system
- Electron and Tauri now use the same packaged server model in
production, reducing platform drift
- packaged desktop apps can successfully create workspaces, launch
`opencode`, and proxy health/session traffic to those instances
- the server bundle is more self-contained and resilient to different
launch environments
- desktop packaging is more predictable because the required server
executable is built and bundled as part of the app build flow

.github/workflows/build-and-upload.yml

@@ -53,7 +53,7 @@ on:
 # least-privilege (e.g. dev CI uses read-only; releases grant write).
 
 env:
-  NODE_VERSION: 20
+  NODE_VERSION: 22
 
 jobs:
   build-macos:
@@ -372,7 +372,7 @@ jobs:
             if [ "$attempt" -gt 1 ]; then
               echo "Retrying Tauri CLI install (attempt $attempt)..."
             fi
-            npm install @tauri-apps/cli@2.9.4 @tauri-apps/cli-darwin-x64@2.9.4 --no-save --no-audit --no-fund --workspaces=false
+            npm install @tauri-apps/cli@2.10.1 @tauri-apps/cli-darwin-x64@2.10.1 --no-save --no-audit --no-fund --workspaces=false
             node -e "require('@tauri-apps/cli'); console.log('Tauri CLI loaded')" && exit 0
           done
           echo "Tauri CLI failed to load after retries" >&2
@@ -456,7 +456,7 @@ jobs:
             if [ "$attempt" -gt 1 ]; then
               echo "Retrying Tauri CLI install (attempt $attempt)..."
             fi
-            npm install @tauri-apps/cli@2.9.4 @tauri-apps/cli-darwin-arm64@2.9.4 --no-save --no-audit --no-fund --workspaces=false
+            npm install @tauri-apps/cli@2.10.1 @tauri-apps/cli-darwin-arm64@2.10.1 --no-save --no-audit --no-fund --workspaces=false
             node -e "require('@tauri-apps/cli'); console.log('Tauri CLI loaded')" && exit 0
           done
           echo "Tauri CLI failed to load after retries" >&2
@@ -542,7 +542,7 @@ jobs:
             if [ "$attempt" -gt 1 ]; then
               echo "Retrying Tauri CLI install (attempt $attempt)..."
             fi
-            npm install @tauri-apps/cli@2.9.4 @tauri-apps/cli-win32-x64-msvc@2.9.4 --no-save --no-audit --no-fund --workspaces=false
+            npm install @tauri-apps/cli@2.10.1 @tauri-apps/cli-win32-x64-msvc@2.10.1 --no-save --no-audit --no-fund --workspaces=false
             node -e "require('@tauri-apps/cli'); console.log('Tauri CLI loaded')" && exit 0
           done
           echo "Tauri CLI failed to load after retries" >&2
@@ -614,6 +614,7 @@ jobs:
           sudo apt-get install -y \
             build-essential \
             pkg-config \
+            xdg-utils \
             libgtk-3-dev \
             libglib2.0-dev \
             libwebkit2gtk-4.1-dev \
@@ -642,6 +643,7 @@ jobs:
             if [ "$attempt" -gt 1 ]; then
               echo "Retrying Tauri CLI install (attempt $attempt)..."
             fi
+            # Tauri CLI 2.10.1 regresses Linux AppImage bundling in CI; keep Linux on the last known-good CLI.
             npm install @tauri-apps/cli@2.9.4 @tauri-apps/cli-linux-x64-gnu@2.9.4 --no-save --no-audit --no-fund --workspaces=false
             node -e "require('@tauri-apps/cli'); console.log('Tauri CLI loaded')" && exit 0
           done
@@ -741,6 +743,7 @@ jobs:
           sudo apt-get install -y \
             build-essential \
             pkg-config \
+            xdg-utils \
             gcc-aarch64-linux-gnu \
             g++-aarch64-linux-gnu \
             libgtk-3-dev:arm64 \

.github/workflows/manual-npm-publish.yml

@@ -46,7 +46,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     env:
-      NODE_VERSION: 20
+      NODE_VERSION: 22
     steps:
       - name: Checkout
         uses: actions/checkout@v4

.github/workflows/release-ui.yml

@@ -14,7 +14,7 @@ permissions:
   contents: read
 
 env:
-  NODE_VERSION: 20
+  NODE_VERSION: 22
 
 jobs:
   release-ui:

.github/workflows/reusable-release.yml

@@ -39,7 +39,7 @@ permissions:
   contents: write
 
 env:
-  NODE_VERSION: 20
+  NODE_VERSION: 22
 
 jobs:
   prepare-release: