HDDS-9858. Add comprehensive user guide documentation.

[kerneltime]

What changes were proposed in this pull request?

This adds complete user guide documentation with:

• Client interfaces documentation (o3, ofs, s3, s3a, httpfs, java-client-api)
• Integration guides (Hive, Hue, Iceberg, Impala, Oozie, Spark, Trino)
• All associated integration logos and images
• Proper navigation structure with DocCardList components
• Updated spelling dictionary for technical terms

The documentation provides detailed configuration instructions, usage examples, and best practices for each client interface and integration. Replaces placeholder content with comprehensive guides for end users to interact with Ozone storage systems.

Generated-by: Claude and Gemini

What is the link to the Apache Jira?

HDDS-9858

How was this patch tested?

Check off which of the following tests were done on this change. If additional testing was done, please elaborate here as well.

• The CI checks on my fork are passing
• I verified the rendered content using a local preview
• I manually verified the steps provided in this change work as described

[Copilot]

Pull Request Overview

This PR replaces placeholder user guide content with complete, detailed documentation for client interfaces and system integrations in Apache Ozone. Key changes include:

• Removal of stub integration and client pages under 03-integrations and 02-clients.
• Addition of full integration guides under 02-integrations (Hive, Hue, Iceberg, Impala, Oozie, Spark, Trino).
• Expansion of client interface docs under 01-client-interfaces and updates to the spelling dictionary.

Reviewed Changes

Copilot reviewed 26 out of 39 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
docs/04-user-guide/03-integrations/README.mdx	Removed placeholder integrations overview
docs/04-user-guide/02-integrations/README.mdx	Added main integrations overview with DocCardList navigation
docs/04-user-guide/02-integrations/*.md	Added full integration guides for Hive, Hue, Iceberg, Impala, Oozie, Spark, Trino
docs/04-user-guide/02-clients/*.md	Removed placeholders; introduced new client-specific docs
docs/04-user-guide/01-client-interfaces/*.md	Expanded client interface documentation for o3, ofs, s3, s3a, HTTPFS, Java API
cspell.yaml	Updated custom spelling dictionary with technical terms

Comments suppressed due to low confidence (6)

docs/04-user-guide/02-integrations/06-spark.md:1

• Add meaningful frontmatter (e.g., sidebar_label: Spark) between the --- markers so the page shows up correctly in the sidebar.

---

docs/04-user-guide/02-integrations/05-oozie.md:1

• Include frontmatter (--- with sidebar_label: Oozie) at the top so this MD file is properly recognized and labeled in the docs navigation.

# Apache Oozie Integration

docs/04-user-guide/02-integrations/04-impala.md:1

• Add YAML frontmatter (--- and sidebar_label: Impala) to ensure this page is included and labeled in the sidebar correctly.

# Impala

docs/04-user-guide/02-integrations/03-iceberg.md:1

• This file lacks frontmatter; please add --- with a sidebar_label: Iceberg for consistent navigation.

# Apache Iceberg 

docs/04-user-guide/02-integrations/02-hue.md:5

• Add frontmatter (--- with sidebar_label: Hue) above the heading to enable proper labeling in the documentation sidebar.

# Integrating Apache Hue with Ozone

docs/04-user-guide/02-integrations/01-hive.md:5

• Frontmatter (--- with sidebar_label: Hive) is missing; please add it so this guide is included in the navigation.

# Using Apache Hive with Ozone

[jojochuang]

The user guide doc section is almost complete, with a few (Hue, Spark) still being workd on. I think we can close this one.