feat: add fluxer upstream source and self-hosting documentation

- Clone of github.com/fluxerapp/fluxer (official upstream)
- SELF_HOSTING.md: full VM rebuild procedure, architecture overview,
  service reference, step-by-step setup, troubleshooting, seattle reference
- dev/.env.example: all env vars with secrets redacted and generation instructions
- dev/livekit.yaml: LiveKit config template with placeholder keys
- fluxer-seattle/: existing seattle deployment setup scripts

fluxer/.github/workflows/update-word-lists.yaml

@@ -0,0 +1,57 @@
+name: update word-lists
+
+on:
+  schedule:
+    - cron: '0 3 1 * *'
+  workflow_dispatch:
+
+jobs:
+  update-word-lists:
+    runs-on: blacksmith-8vcpu-ubuntu-2404
+    timeout-minutes: 25
+    permissions:
+      contents: write
+      pull-requests: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+        with:
+          ref: canary
+
+      - name: Download latest word lists
+        run: python3 scripts/ci/workflows/update_word_lists.py --step download
+
+      - name: Check for changes
+        id: check_changes
+        run: python3 scripts/ci/workflows/update_word_lists.py --step check_changes
+
+      - name: Update word lists
+        if: steps.check_changes.outputs.changes_detected == 'true'
+        run: python3 scripts/ci/workflows/update_word_lists.py --step update
+
+      - name: Create pull request for updated word lists
+        if: steps.check_changes.outputs.changes_detected == 'true'
+        uses: peter-evans/create-pull-request@v5
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          branch: word-lists-update-${{ github.run_id }}
+          base: canary
+          title: 'chore: update word lists from Tailscale upstream'
+          body: |
+            Automated update of scales.txt and tails.txt from the Tailscale repository.
+
+            These files are used to generate connection IDs for voice connections.
+
+            Source:
+            - https://github.com/tailscale/tailscale/blob/main/words/scales.txt
+            - https://github.com/tailscale/tailscale/blob/main/words/tails.txt
+          commit-message: 'chore: update word lists from Tailscale upstream'
+          files: |
+            fluxer_api/src/words/scales.txt
+            fluxer_api/src/words/tails.txt
+          labels: automation
+
+      - name: No changes detected
+        if: steps.check_changes.outputs.changes_detected == 'false'
+        run: python3 scripts/ci/workflows/update_word_lists.py --step no_changes