docs: api comments say what the endpoints do, not how they came to be (#6277)

Rewrites the internal/api comment blocks to rule 32: task, milestone and
rule ids gone, the stories behind them restated as the constraint they
left, stale references corrected (the stream secret is wired from config,
the timezone handler already refreshes the scheduler, the Android app is
the native client, the design docs cited are not in the repo). Also
rewraps comment lines over 80 columns left by the earlier batches.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/api/admin_search.go

@@ -18,7 +18,7 @@ import (
 	"git.fabledsword.com/bvandeusen/minstrel/internal/wanted"
 )
 
-// Searching for wants and grabbing releases (M502 #5521): the schedule's
+// Searching for wants and grabbing releases: the schedule's
 // settings, each want's candidates, and a person's Search, Grab and "never
 // this one".
 
@@ -33,17 +33,17 @@ type searchSettingsView struct {
 	Tiers               []release.TierInfo `json:"tiers"`
 	LastPassAt          *string            `json:"last_pass_at"`
 	LastPass            json.RawMessage    `json:"last_pass"`
-	// ImportRoot is the library folder new music is filed into (#5522); ""
+	// ImportRoot is the library folder new music is filed into; ""
 	// is the first of ScanPaths, the library's folders.
 	ImportRoot string   `json:"import_root"`
 	ScanPaths  []string `json:"scan_paths"`
-	// The download lifecycle (#5523): seed an imported download to this
+	// The download lifecycle: seed an imported download to this
 	// ratio or for this many days; give up on one nobody shares after this
 	// many hours. 0 is: remove once imported, no time limit, never.
 	SeedRatio  float32 `json:"seed_ratio"`
 	SeedDays   int32   `json:"seed_days"`
 	StallHours int32   `json:"stall_hours"`
-	// UpgradeUntil is the tier a held album is upgraded to (#5524); "" is
+	// UpgradeUntil is the tier a held album is upgraded to; "" is
 	// no quality upgrades.
 	UpgradeUntil string `json:"upgrade_until"`
 }