feat!: universal redesign — drop Minecraft stack, single-crate architecture

- remove Java plugins (velocity/paper), dashboard, all MC-specific code
  (handshake, death_code, varint, hostname-HMAC); available in history pre-v0.2
- merge crates/* into one package with src/bin/{rampart,rampart-manager,rampart-cli}
- ProtocolHandler trait + registry (no implementations yet), universal PoW kept
- XDP: universal L3/L4 filter (xdp/core/) + pluggable hook API (xdp/hooks/),
  fix IPv6 saddr bug; clang build verified
- docs: bilingual knowledge base (docs/kb/: attacks x4, defense-levels,
  practice x3), rewrite README/architecture for universal concept
- TODO.md v4.0: <=300-line module limit, competitor benchmark section (ref/)
- deploy/CI/docs cleanup: no MC references, new binary names

cargo build/clippy(-D warnings)/test green (55 tests)

.github/workflows/ci.yml

@@ -25,8 +25,13 @@ jobs:
       - run: cargo fmt --all --check
       - run: cargo clippy --all-targets --all-features -- -D warnings
       - run: cargo check --all-features
-      - run: cargo build --features xdp --bin rampart-core
-      - run: test -f target/debug/rampart-core
+      - name: XDP — build binaries
+        run: cargo build --features xdp --bins
+      - name: XDP — smoke-check BPF compilation (clang)
+        run: |
+          mkdir -p target/xdp
+          clang -O2 -g -target bpf -c xdp/core/universal_filter.c -o target/xdp/universal_filter.o
+          test -f target/xdp/universal_filter.o
 
   rust-test:
     name: Rust — test
@@ -46,54 +51,13 @@ jobs:
         with:
           command: check
 
-  java-build:
-    name: Java — build plugins
-    runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: plugins
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-java@v4
-        with:
-          java-version: "21"
-          distribution: "temurin"
-          cache: "gradle"
-      - run: ./gradlew build
-      - uses: actions/upload-artifact@v4
-        with:
-          name: rampart-java-plugins
-          path: |
-            plugins/velocity/build/libs/*.jar
-            plugins/paper/build/libs/*.jar
-
-  dashboard-build:
-    name: Dashboard — build
-    runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: dashboard
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
-        with:
-          node-version: "22"
-          cache: "npm"
-          cache-dependency-path: dashboard/package-lock.json
-      - run: npm ci
-      - run: npm run build
-
   docker:
-    name: Docker — build images
+    name: Docker — build edge image
     runs-on: ubuntu-latest
-    needs: [rust-test, java-build]
+    needs: [rust-test]
     steps:
       - uses: actions/checkout@v4
       - uses: docker/setup-buildx-action@v3
-      - uses: actions/download-artifact@v4
-        with:
-          name: rampart-java-plugins
-          path: plugins/
       - name: Build edge
         uses: docker/build-push-action@v6
         with:
@@ -101,19 +65,3 @@ jobs:
           file: deploy/docker/Dockerfile.edge
           load: true
           tags: rampart/edge:ci
-      - name: Build velocity
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: deploy/docker/Dockerfile.velocity
-          load: true
-          tags: rampart/velocity:ci
-      - name: Download Paper jar
-        run: bash deploy/docker/download-paper.sh
-      - name: Build paper
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: deploy/docker/Dockerfile.paper
-          load: true
-          tags: rampart/paper:ci