refactor: remove serde from domain entities for Clean Architecture compliance

- Remove Serialize/Deserialize from File, Folder, Session, User, Contact entities
- Create contact_persistence_dto.rs for JSONB persistence in infrastructure layer
- Update contact_pg_repository to use persistence DTOs
- Fix dependency on zip crate (downgrade from 7.2.0 to 2.1.0)
- Fix unused variable warnings in main.rs
- Move PathService import from domain to infrastructure
- Add missing fields to CoreServices and RepositoryServices
- Create proper service initialization in main.rs

Clean Architecture improvements:
- Domain layer no longer depends on serde framework
- Persistence concerns isolated to infrastructure layer
- TokenClaims in auth_service.rs is only exception (required for JWT)

Dockerfile

@@ -1,5 +1,5 @@
 # Stage 1: Cache dependencies
-FROM rust:1.85-alpine AS cacher
+FROM rust:1.93.0-alpine3.23 AS cacher
 WORKDIR /app
 RUN apk --no-cache upgrade && \
     apk add --no-cache musl-dev pkgconfig postgresql-dev gcc perl make
@@ -10,7 +10,7 @@ RUN mkdir -p src && \
     cargo build --release && \
     rm -rf src target/release/deps/oxicloud*
 # Stage 2: Build the application
-FROM rust:1.85-alpine AS builder
+FROM rust:1.93.0-alpine3.23 AS builder
 WORKDIR /app
 RUN apk --no-cache upgrade && \
     apk add --no-cache musl-dev pkgconfig postgresql-dev gcc perl make