Split Cloud API client operations and conversions by domain

[sdairs]

Closes #375

Summary

• Keep the Cloud API client facade focused on construction, authentication, shared HTTP helpers, and Query API helpers.
• Move all 144 OpenAPI operations into private product-domain modules without changing method signatures or behavior.
• Keep the conversion facade and move all 23 write-back conversions into private ClickStack, Postgres, service, and shared modules.
• Preserve crate-root exports, analyzer inventory, conversion errors, and wire behavior.

Tests

• cargo fmt --all
• cargo check --workspace --all-features
• cargo test -p clickhouse-cloud-api -p clickhouse-openapi-analyzer
• cargo clippy -p clickhouse-cloud-api -p clickhouse-openapi-analyzer --all-targets -- -D warnings

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The top 3 files driving up this estimate:

File	Diff Size	Estimate
crates/clickhouse-cloud-api/src/convert.rs	38.62KB	$1.93
crates/clickhouse-cloud-api/src/client/clickstack.rs	30.68KB	$1.53
crates/clickhouse-cloud-api/src/convert/clickstack.rs	29.07KB	$1.45

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[Copilot]

Pull request overview

Refactors the clickhouse-cloud-api crate to split Cloud API operations and write-back conversions into private, product-domain modules while preserving the existing public API surface (Client methods, crate-root exports, and conversion behavior).

Changes:

• Moved Client OpenAPI operation implementations into domain modules under src/client/ (e.g., organizations, services, Postgres, ClickPipes, ClickStack, UDFs).
• Split write-back conversion implementations out of convert.rs into domain modules under src/convert/, keeping MissingRequiredFields and the conversion facade intact.
• Updated convert.rs module docs/structure to reference the new internal module layout without changing external paths.

Reviewed changes

Copilot reviewed 14 out of 15 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
crates/clickhouse-cloud-api/src/convert.rs	Keeps the conversion facade (MissingRequiredFields) and pulls conversion impls in via internal submodules.
crates/clickhouse-cloud-api/src/convert/shared.rs	Hosts shared write-back conversions (e.g., ResourceTagsV1Response → ResourceTagsV1).
crates/clickhouse-cloud-api/src/convert/service.rs	Hosts service-related write-back conversions (scaling schedule entries, upgrade window).
crates/clickhouse-cloud-api/src/convert/postgres.rs	Hosts Postgres-related write-back conversions (PgConfig, PostgresInstanceConfig).
crates/clickhouse-cloud-api/src/convert/clickstack.rs	Hosts ClickStack write-back conversions, including nested object conversions and union round-tripping.
crates/clickhouse-cloud-api/src/client/activity.rs	Domain module containing activity-related Client operations.
crates/clickhouse-cloud-api/src/client/api_keys.rs	Domain module containing API key Client operations.
crates/clickhouse-cloud-api/src/client/backups.rs	Domain module containing backup-related Client operations.
crates/clickhouse-cloud-api/src/client/clickpipes.rs	Domain module containing ClickPipes-related Client operations.
crates/clickhouse-cloud-api/src/client/clickstack.rs	Domain module containing ClickStack-related Client operations.
crates/clickhouse-cloud-api/src/client/organizations.rs	Domain module containing organization-related Client operations.
crates/clickhouse-cloud-api/src/client/postgres.rs	Domain module containing Postgres-related Client operations.
crates/clickhouse-cloud-api/src/client/services.rs	Domain module containing service-related Client operations (CRUD, scaling, endpoints, settings).
crates/clickhouse-cloud-api/src/client/udfs.rs	Domain module containing UDF-related Client operations.

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[iskakaushik]

LGTM