feat(tapo-agent): add schedule/countdown timer API support

- Fork tapo crate to add missing schedule/timer APIs
- Add get_countdown_rules, get_schedule_rules, get_next_event methods
- New readings: countdown_active, countdown_remain, schedule_count,
  schedule_active_count, next_event_time
- Add local compilation to build script alongside cross-compilation
- Implement offline polling - device collection continues when server disconnects
- Add more device readings: on_time, signal_level, rssi, runtime_today/month, energy_month

Vendored tapo fork in tapo-fork/ with minimal changes to add schedule APIs.

agents/tapo/tapo-fork/.github/workflows/rs-ci.yml

@@ -0,0 +1,64 @@
+name: Rust
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - "*"
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  checks:
+    name: Rust checks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy, rustfmt
+      - uses: davidB/rust-cargo-make@v1
+      - uses: actions/checkout@v6
+      - name: Run format
+        run: cargo make format
+      - name: Run check
+        run: cargo make check
+      - name: Run check doc
+        run: cargo make check-doc
+      - name: Run clippy
+        run: cargo make clippy
+      - name: Run test
+        run: cargo make test
+  checks_min_ver:
+    name: Rust checks on the minimum supported version
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: 1.88.0
+      - uses: davidB/rust-cargo-make@v1
+      - uses: actions/checkout@v6
+      - name: Run check on the minimum supported version
+        run: cargo +1.88.0 make check
+  publish:
+    name: Publish
+    runs-on: ubuntu-latest
+    if: ${{ startsWith(github.ref, 'refs/tags/') || github.event_name == 'workflow_dispatch' }}
+    needs: [checks, checks_min_ver]
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          ref: main
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Run cargo login
+        run: cargo login ${CRATES_IO_TOKEN}
+        env:
+          CRATES_IO_TOKEN: ${{ secrets.CRATES_IO_TOKEN }}
+      - name: Run build
+        run: cargo build --package tapo --release --verbose
+      - name: Run cargo publish
+        if: ${{ startsWith(github.ref, 'refs/tags/v') }}
+        run: cargo publish --package tapo