feat(conf): read polish — search text, space-view round-trip, attachment upload

[aurokin]

Summary

Three Confluence read-surface improvements (PR26 of the post-review improvement plan), plus a small shared-helper extraction:

• search text <query> shorthand — builds text ~ "<query>" CQL and appends and type = "<type>" / and space = "<key>" when --type/--space are given, so common free-text lookups need no hand-written CQL. Values are quoted as CQL string literals with backslashes and embedded quotes escaped (cqlEscape doubles \ before escaping ").
• space view round-trip removal — previously it did FindSpaceByKey then a second GetSpace by id. The keys-filtered list already returns the full space object, so a shared findSpaceRaw renders its first match directly (and resolveSpace delegates to it). --json still emits the raw space object.
• attachment upload <page-id> --file <path> — uploads a file as an attachment. Confluence v2 has no attachment-create endpoint, so it uses REST v1 (POST /content/{page-id}/child/attachment) with a multipart body and the X-Atlassian-Token: no-check header.

Dedup

Extracts restutil.MultipartFile (builds the multipart upload body + content type, returns request_encode_failed on failure), now used by both jira.AddAttachment and the new conf.CreateAttachment.

Test plan

• make check — green
• make lint — 0 issues
• go vet -tags=integration ./integration/... — clean
• New tests: TestClientCreateAttachment; TestSearchTextBuildsCQL, TestSearchTextEscapesQuotes, TestSearchTextBuildCQLNoFlags, TestCQLEscapeBackslashAndQuote; TestAttachmentUploadSendsFile, TestAttachmentUploadRequiresFile; updated space view tests assert the single round-trip

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