Split tool from content: eec-campaigns becomes a standalone CLI

Campaign content and listmonk credentials now live in separate
per-domain repos that install this tool at a pinned version, so a
client with access to one domain's content repo has no path to
another domain's secrets. Renames the module to the actual Gitea
host path so `go install` works without vanity-import redirects,
drops the four workflows that assumed campaigns/ content lived here,
adds real go-test CI, and rewrites the README for the tool's new
audience.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -0,0 +1,21 @@
+name: CI
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.23.1"
+
+      - name: Build
+        run: go build ./...
+
+      - name: Test
+        run: go test ./...

.gitea/workflows/send.yml

@@ -1,45 +0,0 @@
-name: Send campaign
-on:
-  # Pushing a tag like send/big-announcement is the primary trigger — a
-  # deliberate, git-native, auditable action (git log --tags shows every
-  # real send that ever happened). These are "command tags," not release
-  # tags: fine to delete and re-push if a send needs retrying, since the
-  # actual safety net is listmonk's own draft/paused status check in
-  # `campaigns send`, not tag uniqueness.
-  push:
-    tags: ["send/*"]
-  # workflow_dispatch is kept alongside it for when clicking a button is
-  # more convenient than a local `git tag && git push`. Same command either
-  # way.
-  workflow_dispatch:
-    inputs:
-      slug:
-        description: "Campaign slug (campaigns/<slug>/) to send"
-        required: true
-        type: string
-
-jobs:
-  send:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23.1"
-
-      - name: Determine campaign slug
-        id: slug
-        run: |
-          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
-            echo "value=${{ inputs.slug }}" >> "$GITHUB_OUTPUT"
-          else
-            echo "value=${GITHUB_REF#refs/tags/send/}" >> "$GITHUB_OUTPUT"
-          fi
-
-      - name: Send campaign
-        run: go run . send "${{ steps.slug.outputs.value }}"
-        env:
-          LISTMONK_BASE_URL: ${{ secrets.CAMPAIGNS_LISTMONK_BASE_URL }}
-          LISTMONK_API_USER: ${{ secrets.CAMPAIGNS_LISTMONK_API_USER }}
-          LISTMONK_API_TOKEN: ${{ secrets.CAMPAIGNS_LISTMONK_API_TOKEN }}

.gitea/workflows/sync-template.yml

@@ -1,20 +0,0 @@
-name: Sync default campaign template
-on:
-  workflow_dispatch: {}
-
-jobs:
-  sync-template:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23.1"
-
-      - name: Sync template to listmonk
-        run: go run . template "eec-campaigns default" email-templates/campaign.html
-        env:
-          LISTMONK_BASE_URL: ${{ secrets.CAMPAIGNS_LISTMONK_BASE_URL }}
-          LISTMONK_API_USER: ${{ secrets.CAMPAIGNS_LISTMONK_API_USER }}
-          LISTMONK_API_TOKEN: ${{ secrets.CAMPAIGNS_LISTMONK_API_TOKEN }}

.gitea/workflows/sync.yml

@@ -1,22 +0,0 @@
-name: Sync campaigns
-on:
-  push:
-    branches: [master]
-
-jobs:
-  sync:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23.1"
-
-      - name: Sync campaigns to listmonk
-        run: go run . sync .
-        env:
-          LISTMONK_BASE_URL: ${{ secrets.CAMPAIGNS_LISTMONK_BASE_URL }}
-          LISTMONK_API_USER: ${{ secrets.CAMPAIGNS_LISTMONK_API_USER }}
-          LISTMONK_API_TOKEN: ${{ secrets.CAMPAIGNS_LISTMONK_API_TOKEN }}
-          CAMPAIGNS_PREVIEW_EMAIL: ${{ secrets.CAMPAIGNS_PREVIEW_EMAIL }}

.gitea/workflows/test.yml

@@ -1,29 +0,0 @@
-name: Test-send campaign
-on:
-  workflow_dispatch:
-    inputs:
-      slug:
-        description: "Campaign slug (campaigns/<slug>/) to preview"
-        required: true
-        type: string
-      email:
-        description: "Address to send the preview to"
-        required: true
-        type: string
-
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: actions/setup-go@v5
-        with:
-          go-version: "1.23.1"
-
-      - name: Send preview
-        run: go run . test "${{ inputs.slug }}" "${{ inputs.email }}"
-        env:
-          LISTMONK_BASE_URL: ${{ secrets.CAMPAIGNS_LISTMONK_BASE_URL }}
-          LISTMONK_API_USER: ${{ secrets.CAMPAIGNS_LISTMONK_API_USER }}
-          LISTMONK_API_TOKEN: ${{ secrets.CAMPAIGNS_LISTMONK_API_TOKEN }}