feat: Phase 1 — extract the client (web SPA + desktop) to dtoro/oikos-web

Problem: the hexagonal refactor churns the backend tree for nine more
phases; the UI delivery stack (web/ SPA, cmd/desktop Wails wrapper,
compose/web image) must move to its own repo first so doc/layout
rewrites land once on a backend-only tree.

Change:
- New repo git.hubris.network/dtoro/oikos-web (v0.33.0): web/, desktop/
  (updateURL repointed to oikos-web releases), compose/, own CI (web +
  desktop jobs), own deploy script (CI-green gate, TOCTOU guard,
  version-tagged images, prune-to-3), own webhook receiver on :9798 +
  launchd unit, own compose project publishing the same 8091:80.
- Cutover executed on mac-mini in order: oikos stack's web service
  stopped+removed, oikos-web project brought up on 8091; outer Caddy
  untouched (targets the published port) — serving + Authentik flow +
  /wails 404 quirk verified post-cutover.
- Stripped from oikos: web/, cmd/desktop/, compose/web/, desktop CI
  workflow, ci.yml web job, Makefile ui/desktop/desktop-package/install
  targets, the compose web service, oikos-web from deploy.sh's fallback
  prune list; wails + go-keyring dropped from go.mod, vendor synced.
- README / CONTRIBUTING / AGENTS.md / .agents dev+operations docs now
  point at the new repo; mbse + mascot design docs carry a path note.

Risk: production SPA serving depends on the new pipeline now; rollback
is versioned-image re-up of the old web service from a pre-split
checkout (port 8091). Desktop builds installed before the split still
check dtoro/oikos releases — one manual reinstall, noted in the
oikos-web release notes.

Verification: go vet, make test (race), make generate-check, golangci
(no new findings; baseline down 400→365); post-cutover curls —
localhost:8091 200, /wails/runtime.js 404, outer Caddy 302 Authentik.

web/node_modules/postcss-safe-parser/lib/safe-parser.js

@@ -0,0 +1,99 @@
+let tokenizer = require('postcss/lib/tokenize')
+let Comment = require('postcss/lib/comment')
+let Parser = require('postcss/lib/parser')
+
+class SafeParser extends Parser {
+  createTokenizer() {
+    this.tokenizer = tokenizer(this.input, { ignoreErrors: true })
+  }
+
+  comment(token) {
+    let node = new Comment()
+    this.init(node, token[2])
+    let pos =
+      this.input.fromOffset(token[3]) ||
+      this.input.fromOffset(this.input.css.length - 1)
+    node.source.end = {
+      offset: token[3],
+      line: pos.line,
+      column: pos.col
+    }
+
+    let text = token[1].slice(2)
+    if (text.slice(-2) === '*/') text = text.slice(0, -2)
+
+    if (/^\s*$/.test(text)) {
+      node.text = ''
+      node.raws.left = text
+      node.raws.right = ''
+    } else {
+      let match = text.match(/^(\s*)([^]*\S)(\s*)$/)
+      node.text = match[2]
+      node.raws.left = match[1]
+      node.raws.right = match[3]
+    }
+  }
+
+  decl(tokens) {
+    if (tokens.length > 1 && tokens.some(i => i[0] === 'word')) {
+      super.decl(tokens)
+    }
+  }
+
+  unclosedBracket() {}
+
+  unknownWord(tokens) {
+    this.spaces += tokens.map(i => i[1]).join('')
+  }
+
+  unexpectedClose() {
+    this.current.raws.after += '}'
+  }
+
+  doubleColon() {}
+
+  unnamedAtrule(node) {
+    node.name = ''
+  }
+
+  precheckMissedSemicolon(tokens) {
+    let colon = this.colon(tokens)
+    if (colon === false) return
+
+    let nextStart, prevEnd
+    for (nextStart = colon - 1; nextStart >= 0; nextStart--) {
+      if (tokens[nextStart][0] === 'word') break
+    }
+    if (nextStart === 0) return
+
+    for (prevEnd = nextStart - 1; prevEnd >= 0; prevEnd--) {
+      if (tokens[prevEnd][0] !== 'space') {
+        prevEnd += 1
+        break
+      }
+    }
+
+    let other = tokens.slice(nextStart)
+    let spaces = tokens.slice(prevEnd, nextStart)
+    tokens.splice(prevEnd, tokens.length - prevEnd)
+    this.spaces = spaces.map(i => i[1]).join('')
+
+    this.decl(other)
+  }
+
+  checkMissedSemicolon() {}
+
+  endFile() {
+    if (this.current.nodes && this.current.nodes.length) {
+      this.current.raws.semicolon = this.semicolon
+    }
+    this.current.raws.after = (this.current.raws.after || '') + this.spaces
+
+    while (this.current.parent) {
+      this.current = this.current.parent
+      this.current.raws.after = ''
+    }
+  }
+}
+
+module.exports = SafeParser