Merge origin/main (Tantivy content search) into delta-sync branch

Both sides added a parameter to create_application_services and a
setup step before it: this branch's storage-usage/quota service (for
the instant-upload path) and main's Tantivy content index (for
SearchService). The resolution keeps both — the signature takes both
arguments and the build runs storage usage as step 3c and the content
index as 3d.

https://claude.ai/code/session_01WdNenpnujNR2sc32XVvwfS

example.env

@@ -196,6 +196,26 @@ DATABASE_URL=postgres://postgres:postgres@localhost:5432/oxicloud
 # Enable search functionality (default: true)
 #OXICLOUD_ENABLE_SEARCH=true
 
+# Full-text content search (embedded Tantivy index over file names AND file
+# content: PDF, Office, plain text/code). Indexing runs on the maintenance
+# pool, off the request path. (default: true)
+#OXICLOUD_ENABLE_CONTENT_SEARCH=true
+
+# Content index directory (default: {OXICLOUD_STORAGE_PATH}/.search-index)
+#OXICLOUD_CONTENT_INDEX_DIR=
+
+# Index worker drain cadence in ms — upper bound on how long a new upload
+# takes to become content-searchable (default: 1500)
+#OXICLOUD_CONTENT_INDEX_FLUSH_MS=1500
+
+# Files larger than this are indexed by name only, no text extraction
+# (default: 33554432 = 32 MiB)
+#OXICLOUD_CONTENT_INDEX_MAX_FILE_BYTES=33554432
+
+# Cap on extracted text per unique blob fed to the index
+# (default: 1048576 = 1 MiB)
+#OXICLOUD_CONTENT_INDEX_MAX_TEXT_BYTES=1048576
+
 # Enable music playlists and audio metadata (default: true)
 #OXICLOUD_ENABLE_MUSIC=true