DoIP Server POC implementation - #1

Define crate as library and binary. Add tokio, serde, toml,
tracing, and thiserror dependencies. Declare top-level modules.

Signed-off-by: VinaykumarRS1995 <Vinaykumarrs1995@gmail.com>

Introduce ServerConfig for TCP, UDP, and ECU identity settings.
Provide InMemoryProvider for defaults and TomlProvider for
file-based configuration loading.

Signed-off-by: VinaykumarRS1995 <Vinaykumarrs1995@gmail.com>

Implement 8-byte header parsing with version validation. Define
TcpPayloadType and UdpPayloadType enums for all supported
message types (0x0001-0x8003) per ISO 13400-2.

Signed-off-by: VinaykumarRS1995 <Vinaykumarrs1995@gmail.com>

Introduce PayloadHandler<PayloadType, Request> trait for handler
implementations. Build Dispatcher with HashMap-based routing
from payload type to handler, generic over transport.

Signed-off-by: VinaykumarRS1995 <Vinaykumarrs1995@gmail.com>

Define SovdProxy trait with forward() for UDS byte translation.
StubProxy returns NRC 0x11 pending real backend integration.
MockProxy echoes input for unit testing.

Signed-off-by: VinaykumarRS1995 <Vinaykumarrs1995@gmail.com>

Add handlers for VehicleIdentification (0x0001-0x0003), VIN
request (0x0004), and EntityStatus (0x4001). Vehicle ID handlers
share common announcement-building logic.

Signed-off-by: VinaykumarRS1995 <Vinaykumarrs1995@gmail.com>

Add AliveCheck (0x0007) responding to keep-alive pings.
RoutingActivation (0x0005) returns 0x10 as placeholder
until full state-machine logic is implemented.

Signed-off-by: VinaykumarRS1995 <Vinaykumarrs1995@gmail.com>

Add DiagnosticsHandler (0x8001) forwarding UDS bytes via SovdProxy
and returning DiagnosticMessagePositiveAck. Wire all handlers into
build_tcp_dispatcher() and build_udp_dispatcher().

Signed-off-by: VinaykumarRS1995 <Vinaykumarrs1995@gmail.com>

Add TCP listener with per-connection task spawning. DoIP framer
reconstructs complete messages from partial reads. UDP uses
simple recv-parse-dispatch loop with no framing needed.

Signed-off-by: VinaykumarRS1995 <Vinaykumarrs1995@gmail.com>

Enforce max concurrent TCP connections using atomic counter.
SessionSlot acts as RAII guard that auto-releases on drop,
ensuring cleanup on disconnection or task cancellation.

Signed-off-by: VinaykumarRS1995 <Vinaykumarrs1995@gmail.com>

Add Server struct that starts both listeners concurrently
and coordinates graceful shutdown via cancellation token.

Signed-off-by: VinaykumarRS1995 <Vinaykumarrs1995@gmail.com>

Wire all layers in main(): load config, build dispatchers,
start transports, handle SIGINT shutdown. Include DoIP tester
for manual integration testing against a running server.

Signed-off-by: VinaykumarRS1995 <Vinaykumarrs1995@gmail.com>

- Convert to Cargo workspace (lib + app + client)
- Narrow tokio features to specific set
- Refactor handlers to accept EcuConfig directly
- Tighten visibility (pub(super), pub(in crate::...))
- Remove DEFAULT_ prefix in defaults module
- Add compile_fail doc test for transport segregation
- Add TODO comments for future improvements
- Update README (headings, commands, abbreviations)
- Add sample-doip-server.toml
- Regenerate SVGs from updated puml sources

- Rename common.rs to utils.rs in vehicle identification handlers
- Rename InMemoryConfigProvider to DefaultConfigProvider
- Fix Toml_provider casing to toml_provider
- Move sample-doip-server.toml into app/
- Add ISO references, design decisions, and validation TODOs across codebase

Signed-off-by: VinaykumarRS1995 <Vinaykumarrs1995@gmail.com>