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)

Cargo.lock

@@ -333,56 +333,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "crossbeam"
-version = "0.8.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1137cd7e7fc0fb5d3c5a8678be38ec56e819125d8d7907411fe24ccb943faca8"
-dependencies = [
- "crossbeam-channel",
- "crossbeam-deque",
- "crossbeam-epoch",
- "crossbeam-queue",
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-channel"
-version = "0.5.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d85363c37faeca707aef026efa9f3b34d077bce547e48f770770625c6013679e"
-dependencies = [
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-deque"
-version = "0.8.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5181e0de7b61eb03a81e347d6dd8797bae9da5146707b51077e2d71a54ec0ceb"
-dependencies = [
- "crossbeam-epoch",
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-epoch"
-version = "0.9.20"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2d6914041f254d6e9176c01941b21115dcfb7089e55135a35411081bd106ef3f"
-dependencies = [
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-queue"
-version = "0.3.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "803d13fb3b09d88be9f4dbc29062c66b19bf7170867ceb746d2a8689bf6c7a26"
-dependencies = [
- "crossbeam-utils",
-]
-
 [[package]]
 name = "crossbeam-utils"
 version = "0.8.22"
@@ -427,7 +377,6 @@ checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
  "block-buffer",
  "crypto-common",
- "subtle",
 ]
 
 [[package]]
@@ -639,15 +588,6 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
-[[package]]
-name = "hmac"
-version = "0.12.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
-dependencies = [
- "digest",
-]
-
 [[package]]
 name = "http"
 version = "1.4.2"
@@ -1349,29 +1289,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8dcc9c7d52a811697d2151c701e0d08956f92b0e24136cf4cf27b57a6a0d9bf"
 
 [[package]]
-name = "rampart-cli"
-version = "0.2.0"
-dependencies = [
- "anyhow",
- "clap",
- "reqwest",
- "serde",
- "serde_json",
- "tokio",
- "tracing",
-]
-
-[[package]]
-name = "rampart-core"
-version = "0.2.0"
+name = "rampart"
+version = "0.3.0-dev"
 dependencies = [
  "anyhow",
+ "axum",
  "chrono",
- "crossbeam",
+ "clap",
  "dashmap",
  "futures",
  "hex",
- "hmac",
+ "jsonwebtoken",
  "libbpf-rs",
  "libc",
  "maxminddb",
@@ -1388,26 +1316,6 @@ dependencies = [
  "tokio",
  "tokio-splice",
  "toml",
- "tracing",
- "tracing-subscriber",
-]
-
-[[package]]
-name = "rampart-manager"
-version = "0.2.0"
-dependencies = [
- "anyhow",
- "axum",
- "chrono",
- "dashmap",
- "jsonwebtoken",
- "prometheus",
- "redis",
- "serde",
- "serde_json",
- "subtle",
- "thiserror 2.0.19",
- "tokio",
  "tower-http",
  "tracing",
  "tracing-subscriber",