feat(server): add repository prefix path configuration and service struct

- Add REPO_PREFIX_PATH environment variable support in Dockerfile and main.rs
- Introduce GitksService struct with repo_prefix field to manage repository paths
- Implement resolve and resolve_for_init methods for repository path handling
- Add path traversal protection and validation for repository operations
- Update all service implementations to use self.resolve instead of global resolve
- Modify serve function to accept repo_prefix parameter and pass to GitksService
- Remove global resolve functions and integrate them into GitksService struct
- Add proper initialization of repo directory from environment variable

server/archive.rs

@@ -1,6 +1,6 @@
 use crate::pb::*;
 
-use super::{GitksService, into_status, into_stream, resolve};
+use super::{GitksService, into_status, into_stream};
 
 #[tonic::async_trait]
 impl archive_service_server::ArchiveService for GitksService {
@@ -12,7 +12,7 @@ impl archive_service_server::ArchiveService for GitksService {
         request: tonic::Request<ArchiveRequest>,
     ) -> Result<tonic::Response<Self::GetArchiveStream>, tonic::Status> {
         let inner = request.into_inner();
-        let gb = resolve(inner.repository.as_ref())?;
+        let gb = self.resolve(inner.repository.as_ref())?;
         let chunks = gb.get_archive(inner).map_err(into_status)?;
         Ok(tonic::Response::new(into_stream(chunks)))
     }
@@ -22,7 +22,7 @@ impl archive_service_server::ArchiveService for GitksService {
         request: tonic::Request<ListArchiveEntriesRequest>,
     ) -> Result<tonic::Response<ListArchiveEntriesResponse>, tonic::Status> {
         let inner = request.into_inner();
-        let gb = resolve(inner.repository.as_ref())?;
+        let gb = self.resolve(inner.repository.as_ref())?;
         let resp = gb.list_archive_entries(inner).map_err(into_status)?;
         Ok(tonic::Response::new(resp))
     }