feat: add fluxer upstream source and self-hosting documentation

- Clone of github.com/fluxerapp/fluxer (official upstream)
- SELF_HOSTING.md: full VM rebuild procedure, architecture overview,
  service reference, step-by-step setup, troubleshooting, seattle reference
- dev/.env.example: all env vars with secrets redacted and generation instructions
- dev/livekit.yaml: LiveKit config template with placeholder keys
- fluxer-seattle/: existing seattle deployment setup scripts

fluxer/fluxer_devops/clamav/conf/clamd.conf

@@ -0,0 +1,54 @@
+# Listening
+LocalSocket /tmp/clamd.sock
+TCPSocket 3310
+TCPAddr 0.0.0.0
+
+# Threading
+MaxThreads 12
+MaxConnectionQueueLength 30
+
+# Scanner limits
+MaxScanSize 150M
+MaxFileSize 100M
+MaxRecursion 16
+MaxFiles 10000
+MaxEmbeddedPE 10M
+MaxHTMLNormalize 10M
+MaxHTMLNoTags 2M
+MaxScriptNormalize 5M
+MaxZipTypeRcg 1M
+
+# Scanning options
+ScanPE yes
+ScanELF yes
+ScanOLE2 yes
+ScanPDF yes
+ScanSWF yes
+ScanHTML yes
+ScanMail yes
+ScanArchive yes
+ScanPartialMessages yes
+AlertBrokenExecutables yes
+AlertEncrypted no
+AlertEncryptedArchive no
+AlertEncryptedDoc no
+AlertOLE2Macros yes
+AlertPhishingSSLMismatch no
+AlertPhishingCloak no
+
+# Database
+DatabaseDirectory /var/lib/clamav
+OfficialDatabaseOnly no
+DetectPUA yes
+ExcludePUA NetTool
+ExcludePUA PWTool
+HeuristicScanPrecedence yes
+
+# Logging
+LogTime yes
+LogClean no
+LogVerbose no
+ExtendedDetectionInfo yes
+
+# Performance
+BytecodeTimeout 60000