docs(clp-s): Add skeleton for clp-s design documentation; Write first half of clp-s single-file archive design document.

docs/src/dev-guide/design-clp-structured/background.md

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+# Background
+
+The [kv-ir background section](../design-kv-ir-streams/background.md) contains partial background
+information about clp-s.
+
+:::{warning}
+🚧 This section is still under construction.
+:::

docs/src/dev-guide/design-clp-structured/index.md

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+# clp-s
+
+The compressed-log-processor-structured (abbreviated as clp-s and also known as [μSlope][μSlope])
+archive format is a storage format for large chunks of dynamically structured (e.g., JSON) logs.
+Compared to the [KV-IR](../design-kv-ir-streams/index.md) streaming compression format clp-s
+achieves higher compression ratios and significantly faster search speeds at the cost of needing to
+aggregate log data before compressing the data into archives and requiring memory proportional to
+archive size for both compression and search. This makes clp-s unsuitable for real-time or severely
+resource-constrained usage but ideal for long-term archival and search.
+
+::::{grid} 1 1 1 1
+:gutter: 2
+
+:::{grid-item-card}
+:link: background
+Background
+^^^
+Any necessary information to understand clp-s' format.
+:::
+
+:::{grid-item-card}
+:link: single-file-archive-format
+Single-file archive format
+^^^
+A detailed reference for the single-file archive format.
+:::
+::::
+
+:::{warning}
+🚧 This section is still under construction.
+:::
+
+:::{toctree}
+:hidden:
+
+background
+single-file-archive-format
+:::
+
+[μSlope]: https://www.usenix.org/conference/osdi24/presentation/wang-rui