chore: replace upstream CI with fork-specific workflows (#2)

Author: yunyu950908

.github/workflows/README.md

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+# CI/CD Workflows
+
+This is a fork of [mem9-ai/mem9](https://github.com/mem9-ai/mem9). Upstream CI workflows (`deploy-dev.yml`, `sync-claude-plugin.yml`) have been removed as they depend on upstream-specific secrets and infrastructure.
+
+## Workflows
+
+| Workflow | Trigger | Description |
+|---|---|---|
+| `sync-fork.yml` | Daily (UTC 08:00) / Manual | Syncs `main` branch with upstream via GitHub merge-upstream API. Automatically triggers `build-swr` when new commits are synced. |
+| `build-swr.yml` | Manual / Auto (via sync-fork) | Builds `mnemo-server` Docker image using `make docker` and pushes to Huawei Cloud SWR with `SHORT_SHA` and `latest` tags. |
+
+## Required Secrets
+
+| Secret | Description |
+|---|---|
+| `SWR_REGISTRY` | SWR endpoint, e.g. `swr.cn-north-4.myhuaweicloud.com` |
+| `SWR_ORGANIZATION` | SWR organization / namespace |
+| `SWR_USERNAME` | SWR login username (typically `region@AK`) |
+| `SWR_PASSWORD` | SWR login password or temporary token |

.github/workflows/deploy-dev.yml

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+name: Sync fork with upstream
+
+on:
+  schedule:
+    - cron: "0 8 * * *"
+  workflow_dispatch:
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Sync fork
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const result = await github.rest.repos.mergeUpstream({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              branch: 'main',
+            });
+            const mergeType = result.data.merge_type ?? 'none';
+            console.log(`Sync result: ${mergeType}`);
+            if (mergeType !== 'none') {
+              console.log('New commits synced, triggering build-swr workflow');
+              await github.rest.actions.createWorkflowDispatch({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                workflow_id: 'build-swr.yml',
+                ref: 'main',
+              });
+            }