feat: 实现 MediaMTX 分片分配与故障范围可观察 (#77)

Sense/tests/package/run-tests.ps1

@@ -34,6 +34,7 @@ try {
     [IO.File]::WriteAllText((Join-Path $temporary 'web\js\runtime.fixture.js'), 'fixture', (New-Object Text.UTF8Encoding($false)))
     [IO.File]::WriteAllText((Join-Path $temporary 'bin\mediamtx.exe'), 'fixture', (New-Object Text.UTF8Encoding($false)))
     [IO.File]::WriteAllText((Join-Path $temporary 'config\mediamtx.yml'), 'api: true', (New-Object Text.UTF8Encoding($false)))
+    [IO.File]::WriteAllText((Join-Path $temporary 'config\mediamtx-shards.json'), '[]', (New-Object Text.UTF8Encoding($false)))
 
     $webAssetAudit = Join-Path $senseRoot 'scripts\build\assert-web-assets.ps1'
     & $webAssetAudit -WebRoot (Join-Path $temporary 'web')
@@ -55,6 +56,7 @@ try {
         'SENSE_MEDIAMTX_BINARY=bin\mediamtx.exe',
         'SENSE_MEDIAMTX_CONFIG=config\mediamtx.yml',
         'SENSE_MEDIAMTX_API=http://127.0.0.1:9997',
+        'SENSE_MEDIAMTX_SHARDS_FILE=config\mediamtx-shards.json',
         'SENSE_WEB_ROOT=web'
     ) -join "`n"
     [IO.File]::WriteAllText((Join-Path $temporary 'config\sense.env'), $envText, (New-Object Text.UTF8Encoding($false)))
@@ -68,6 +70,7 @@ try {
     Assert-True $generatedSettings.Contains('timeout: 2592000') 'generated runtime settings must keep login valid for 30 days'
     Assert-True ((Get-SenseEnvironmentValue -Name 'SENSE_DATABASE_URL').Contains('p#&;=x')) 'special characters must survive env parsing'
     Assert-True ($generatedSettings.Contains('password=p#\u0026;=x')) 'special characters must be safely JSON-escaped in YAML'
+    Assert-Equal (Join-Path $temporary 'config\mediamtx-shards.json') (Get-SenseEnvironmentValue -Name 'SENSE_MEDIAMTX_SHARDS_FILE') 'relative shard config path must resolve inside package root'
     Assert-True (-not ((Get-SenseDatabaseInfo (Get-SenseEnvironmentValue -Name 'SENSE_DATABASE_URL')).Sanitized.Contains('password='))) 'PostgreSQL tool arguments must not contain password'
 
     [Environment]::SetEnvironmentVariable('SENSE_PORT', $null, 'Process')