build: Docker compose build successful with all services

- Fixed Dockerfiles (removed admin-ui references)
- Updated Cargo.toml workspace
- Added @tailwindcss/postcss dependency
- All services building and running correctly

apps/api/Dockerfile

@@ -4,12 +4,10 @@ WORKDIR /app
 COPY Cargo.toml ./
 COPY apps/api/Cargo.toml apps/api/Cargo.toml
 COPY apps/indexer/Cargo.toml apps/indexer/Cargo.toml
-COPY apps/admin-ui/Cargo.toml apps/admin-ui/Cargo.toml
 COPY crates/core/Cargo.toml crates/core/Cargo.toml
 COPY crates/parsers/Cargo.toml crates/parsers/Cargo.toml
 COPY apps/api/src apps/api/src
 COPY apps/indexer/src apps/indexer/src
-COPY apps/admin-ui/src apps/admin-ui/src
 COPY crates/core/src crates/core/src
 COPY crates/parsers/src crates/parsers/src