Feat: add wireviz-web based wireviz syntax renderer

Add a renderer for wireviz syntax.

This renderer requires a wireviz-web server running / reachable via plugin definable url.

The renderer sends then the wireviz code to it and receives html which is inlined in the markdown code.

See README.md for more details.

server/modules/rendering/markdown-wireviz/README.md

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+# WireViz Renderer
+
+This provides a WireViz Markdown renderer plugin for Wiki.js, allowing you to embed WireViz diagrams directly in Wiki.js pages. Diagrams are rendered via a WireViz-Web server, either locally or remotely.
+
+
+## Install
+
+* Install https://github.com/wireviz/wireviz-web
+* Start wireviz-web server
+* Configure Wiki.js WireViz plugin
+    * Set wirevizWebUrl to point to wireviz-web server URL
+    * Enable WireViz plugin
+
+## Test
+
+Add this to your Markdown page
+
+````markdown
+```wireviz
+connectors:
+  X1:
+    type: Molex 39-29-9042
+    pinlabels: [GND, +12V]
+  X2:
+    type: Molex 39-29-9042
+    pinlabels: [GND, +12V]
+
+cables:
+  W1:
+    gauge: 18 AWG3
+    length: 1.5
+    color_code: DIN
+    wirecount: 2
+    shield: true
+
+connections:
+  -
+    - X1: [1,2]
+    - W1: [1,2]
+    - X2: [1,2]
+```

server/modules/rendering/markdown-wireviz/definition.yml

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+key: wireviz
+title: WireViz Diagrams
+description: Render WireViz cable/wire diagrams from inline syntax
+author: Custom
+icon: mdi-format-superscript
+enabledDefault: false
+dependsOn: markdownCore
+props:
+  wirevizWebUrl:
+    type: String
+    title: WireViz Web URL
+    hint: URL of the WireViz Web service
+    default: http://localhost:3005
+    order: 1

server/modules/rendering/markdown-wireviz/renderer.js

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+const { spawnSync } = require('child_process')
+
+module.exports = {
+  init(mdinst, conf = {}) {
+    this.md = mdinst
+    this.conf = conf
+    this.logger = (typeof WIKI !== 'undefined' && WIKI.logger) ? WIKI.logger : console
+    this.wirevizWebUrl =
+      conf.wirevizWebUrl ||
+      'http://localhost:3005'
+
+    const originalFence = mdinst.renderer.rules.fence || null
+
+    mdinst.renderer.rules.fence = (tokens, idx, options, env, slf) => {
+      const token = tokens[idx]
+      const info = (token.info || '').trim()
+
+      if (!info || !info.startsWith('wireviz')) {
+        return originalFence
+          ? originalFence(tokens, idx, options, env, slf)
+          : `<pre><code>${mdinst.utils.escapeHtml(token.content)}</code></pre>`
+      }
+
+      const wirevizCode = token.content || ''
+
+      try {
+        const html = this.renderViaWirevizWebSync(wirevizCode)
+        return `<div class="wireviz-diagram">${html}</div>`
+      } catch (err) {
+        this.logger.error?.(`WireViz rendering error: ${err.message}`)
+        return `<pre>WireViz Error: ${mdinst.utils.escapeHtml(err.message)}</pre>`
+      }
+    }
+  },
+
+  renderViaWirevizWebSync(wirevizCode) {
+    // Use spawnSync to call curl synchronously and not add a new wikijs dependency
+    const curlArgs = [
+      '-s', // silent
+      '-X', 'POST',
+      '-F', `yml_file=@-`, // read from stdin
+      '-H', 'Accept: text/html',
+      this.wirevizWebUrl.replace(/\/$/, '') + '/render'
+    ]
+
+    const res = spawnSync('curl', curlArgs, {
+      input: wirevizCode,
+      encoding: 'utf8'
+    })
+
+    if (res.error) {
+      throw new Error(`curl failed: ${res.error.message}`)
+    }
+
+    const stdout = res.stdout
+    const stderr = res.stderr
+
+    if (stderr) {
+      this.logger.warn?.('curl stderr: ' + stderr)
+    }
+
+    if (!stdout || !stdout.includes('<svg')) {
+      throw new Error(stdout)
+    }
+
+    return stdout
+  }
+}