feat(settings): add setting for Reality scan candidates (#6471)

* feat(settings): allow customizing Reality scan candidate list

Persist a realityScanCandidates panel setting (defaulting to the previous
hardcoded list), expose it in General Settings with i18n, and have the
Find Targets scanner use it when the search box is empty.

Fixes #5847

* style(frontend): oxfmt realityScanCandidates in setting.ts

* Fix locale JSON syntax

This change removes the malformed duplicate key and missing comma in the Android per-app proxy translations across the bundled locale files. The JSON now parses correctly while preserving the translated labels for each language.

* docs(i18n): update Happ translations

Localize the remaining Happ subscription settings strings across the translation files and refine the English copy. This aligns the labels and descriptions with the current Happ behavior for notifications, TUN options, HWID enforcement, routing presets, and per-app proxy settings.

* refactor(reality): drop test-only scaffolding from the candidate setting

TestDefaultRealityScanCandidatesCSV compared the CSV against its own
initializer and a defaultValueMap lookup, and
TestRealityScanCandidateTokensFallsBackWithoutDB drove a no-database
state no production caller reaches (the only caller is the
scanRealityTargets handler, served after InitDB). The
s != nil && GetDB() != nil guard existed only for that second test.
None of them could fail except in lockstep with the code they restate.

* docs(api): describe the setting-driven scanRealityTargets fallback

An empty targets value now probes the realityScanCandidates setting,
but the endpoint summary, parameter description and handler comment
still promised the built-in seed list, so API consumers were told the
wrong target set. Regenerated openapi.json and synced the docs copy,
which also lacked the new AllSetting field in the settings reference.

---------

Co-authored-by: mrchatam <287639636+mrchatam@users.noreply.github.com>
Co-authored-by: Sanaei <ho3ein.sanaei@gmail.com>

internal/web/translation/en-US.json

@@ -1375,6 +1375,8 @@
       "noisesSett": "Noises Settings",
       "trustedProxyCidrs": "Trusted proxy CIDRs",
       "trustedProxyCidrsDesc": "Comma-separated IPs/CIDRs allowed to set forwarded host, proto, and client IP headers.",
+      "realityScanCandidates": "Reality scan candidates",
+      "realityScanCandidatesDesc": "Comma-separated host:port targets (or CIDRs) used as the default list when Find Targets runs with an empty search. Customize this with destinations you reuse often.",
       "ldap": {
         "enable": "Enable LDAP sync",
         "host": "LDAP host",
@@ -1635,31 +1637,31 @@
       "subHappSubExpireButtonLink": "Renewal Link",
       "subHappSubExpireButtonLinkDesc": "Target URL opened when the user clicks the renewal button on an expired subscription.",
       "subHappNotificationExpire": "Expiration Notifications",
-      "subHappNotificationExpireDesc": "Instruct Happ to alert the user in advance before their subscription expires.",
-      "subHappNoLimit": "Bypass Rule Limit",
-      "subHappNoLimitDesc": "Allow routing rule count to exceed default mobile platform limits without truncation.",
+      "subHappNotificationExpireDesc": "Instruct Happ to remind the user 3 days before their subscription expires.",
+      "subHappNoLimit": "No-Limit Mode",
+      "subHappNoLimitDesc": "Raise the xray-core RAM limit in Happ for better stability and performance (beta).",
       "subHappAlwaysHwid": "Enforce Hardware ID (HWID)",
-      "subHappAlwaysHwidDesc": "Bind subscription sessions to client device hardware identifier for enhanced security.",
+      "subHappAlwaysHwidDesc": "Prevent users from turning off HWID sending in the Happ settings.",
       "subHappTunMode": "TUN Mode",
-      "subHappTunModeDesc": "TUN virtual network interface routing mode: default, system, or strict.",
+      "subHappTunModeDesc": "Network stack used by TUN on desktop: system (OS stack) or gVisor (userspace stack).",
       "subHappTunType": "TUN Engine",
-      "subHappTunTypeDesc": "Underlying network stack implementation for TUN: system, gVisor, or mixed.",
+      "subHappTunTypeDesc": "Core used for the TUN connection on desktop: sing-box, tun2proxy, default (Happ TUN), or Xray.",
       "subHappExcludeRoutes": "Exclude CIDR Routes",
       "subHappExcludeRoutesDesc": "Comma-separated IP CIDRs (e.g. 192.168.0.0/16, 10.0.0.0/8) to bypass the VPN tunnel.",
       "subHappExcludeApns": "Exclude Apple APNs",
       "subHappExcludeApnsDesc": "Bypass Apple Push Notification services to maintain reliable background notifications on iOS.",
       "subHappColorProfile": "Client Color Theme",
-      "subHappColorProfileDesc": "Client color theme profile: default, violet, turquoise, cyberpunk, or custom JSON theme.",
+      "subHappColorProfileDesc": "Custom iOS color theme as a JSON string, or resetcolors to restore the default colors.",
       "subHappPingType": "Latency Ping Method",
-      "subHappPingTypeDesc": "Measurement protocol used by Happ for node latency testing: icmp, tcp, or http.",
+      "subHappPingTypeDesc": "How Happ measures node latency: via proxy (GET or HEAD), TCP, or ICMP.",
       "subHappAutoConnect": "Auto-Connect on Launch",
       "subHappAutoConnectDesc": "Instruct Happ to automatically connect to VPN when the application starts.",
       "subHappAutoConnectType": "Auto-Connect Target",
-      "subHappAutoConnectTypeDesc": "Connection target strategy for auto-connect: fastest node or last used node.",
+      "subHappAutoConnectTypeDesc": "Server chosen for auto-connect: lowest delay, last used, or a random node.",
       "subHappPerAppMode": "Android Per-App Proxy Mode",
-      "subHappPerAppModeDesc": "Control Android application routing: off, include (proxy only listed apps), or exclude (bypass listed apps).",
+      "subHappPerAppModeDesc": "Control Android application routing: off, on (proxy only listed apps), or bypass (exclude listed apps).",
       "subHappPerAppList": "Android Package Names",
-      "subHappPerAppListDesc": "Comma-separated package names of Android applications to include or exclude (e.g. com.telegram.messenger).",
+      "subHappPerAppListDesc": "Comma-separated package names of Android applications to include or exclude (e.g. org.telegram.messenger).",
       "subHappPresetIran": "Iran Bypass",
       "subHappPresetChina": "China Direct",
       "subHappPresetAdblock": "AdBlock",