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[meshnet] Replace veth + libpcap with TAP devices for gRPC wires (#731)

* [meshnet] Replace veth + libpcap with TAP devices for gRPC wires

Replace the veth pair and libpcap packet capture implementation in meshnetd
with persistent Linux TAP devices created directly inside container network
namespaces.

Reason for Change:
- Eliminates packet loss under high traffic loads caused by libpcap's kernel-
  to-userspace drop policy.
- Provides native Linux socket buffer flow control and backpressure (`txqueuelen`)
  up to the container application when gRPC processing falls behind.
- Guarantees protocol transparent packet handling (including LACP and LLDP frames).
- Ensures process crash resilience: setting `TUNSETPERSIST=1` keeps TAP interfaces
  alive in the container netns across daemon restarts without link flaps.
- Synchronizes CNI plugin pod readiness with complete end-to-end gRPC wire setup,
  preventing test/ping race conditions upon pod startup.
- Eliminates CGO and `libpcap-dev` build dependencies, producing a pure Go static
  binary (`CGO_ENABLED=0`).

Key Changes:
- Added `CreateOrAttachTAP` in `wireutil` using `TUNSETIFF` & `TUNSETPERSIST`.
- Replaced `pcap.Handle` with `*os.File` in `gwire_map.go`, `grpcwire.go`, and `handler.go`.
- Updated `ReconcilePodLinks` in `controller.go` to use TAP interfaces directly without
  host-side veth creation.
- Updated `GRPCWireExists` and CNI `cmdAdd` readiness check to block until gRPC wire
  handshakes are fully established.
- Removed `libpcap-dev` and updated Dockerfile to build `meshnetd` with `CGO_ENABLED=0`.

* Lint / format fixes

Add package & public method comments, and format Go

* Resolve codespell complaint

* Review comment - be more diligent with error checking in CreateOrAttachTAP

* Hold wire.mu and preserve wire.StopC in UpdateWireByUID

* Only check GRPCWireExists for inter-node gRPC links in CNI cmdAdd

* • grpcwire.go uses sync.Pool to eliminate per-packet heap allocations and prevent con... (continued)

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Subprojects
ID Flag name Job ID Ran Files Coverage
1 /jobs/185997607 31439658831.1 62
42.2
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