feat: complete DVR and improve streaming, security, configuration, and UI
Complete the Digital Video Recorder subsystem and add a broad set of
reliability, security, streaming, configuration, processing, and Web UI
improvements across Tuliprox.
DVR:
* complete live recording and provider-aware VOD download support
* add recording queue, workers, scheduling, and recurring recording rules
* add conflict detection and capacity-aware scheduling
* add pause, resume, retry, edit, cancel, and delete workflows
* add recording quotas and configurable retention policies
* add crash recovery and startup reconciliation
* add durable lifecycle notifications with per-channel retries
* add DVR health monitoring and diagnostic tooling
* add secure access to recordings, thumbnails, and subtitles
* add WebSocket notifications for recording and rule changes
* add Web UI management for recordings, rules, progress, and task state
* add RBAC, configuration, documentation, and i18n support
Streaming and HLS:
* fix shared-stream idle handling and release dead provider streams correctly
* stop tee streams when both client and cache consumers are gone
* cancel provisioning probes when client streams terminate
* fix transient HLS origin work accounting and intermittent 503 responses
* make stream buffer byte limits configurable
* make shared subscriber idle timeout configurable
* make initial HLS manifest wait timeout configurable
* add configurable TS chunk packet count
* add configurable HLS refresh failure backoff
* centralize redirect limits and retry jitter handling
* improve provider DNS refresh behavior and failover tuning
* preserve UTF-8 characters in catchup templates
* improve stream history validation and persistence error handling
Security:
* use constant-time credential comparisons
* harden library and media path handling against traversal and symlink escapes
* only trust forwarded client IP headers from configured trusted proxies
* redact credentials and sensitive URL data from logs
* reject invalid authentication status-code configuration
* deny users with unresolved plans or invalid content filters
* improve authentication error handling across proxy and HLS endpoints
Configuration and reliability:
* prevent invalid api-proxy.yml reloads from terminating the running server
* fully validate API proxy configuration before persisting changes
* log configuration and EPG cleanup failures instead of silently discarding them
* keep the last valid configuration active after failed hot reloads
* align backend and shared media-server validation
* remove duplicated path and normalization logic
* improve DNS-store recovery and Windows rename fallback handling
* reject invalid duration, timestamp, and numeric conversions safely
* fix playlist bouquet save error handling
* fix provider record update detection
* fix cache boundary handling
* improve startup and persistence failure diagnostics
Filtering, search, sorting, and processing:
* add field-scoped playlist explorer search
* centralize shared stream-history search field definitions
* extend the filter DSL with string, set, and numeric operators
* add EPG ID, channel number, and detected quality as filterable fields
* add filter dry-run preview API with match statistics and samples
* report filter syntax errors with line and column information
* add natural numeric-aware sorting
* add quality-aware channel deduplication
* add accent-independent deduplication
* move natural sorting and quality detection helpers into shared code
* persist explorer search-field selection across reloads
User plans and content access:
* add reusable API user plans for capability tiers
* support inherited cluster and connection limits with per-user overrides
* add plan-level and user-level content filters
* enforce content filters across Xtream, M3U, direct playback, resource access,
stream info, short EPG, categories, and XMLTV
* add trial plans with automatic expiry and Trial status
* add plan selection and content filtering to the user editor
* add full plan management to the API configuration Web UI
* migrate the API user database to schema V7 with plan and filter persistence
Web UI and accessibility:
* add live logging console to the stats page
* improve login error handling and prevent duplicate authentication requests
* add keyboard navigation to tabs, menus, tables, and search
* add ARIA roles, labels, validation state, and live-region feedback
* add confirmation dialogs for destructive actions
* add unsaved-change warnings and Ctrl/Cmd+S shortcuts
* add loading, progress, empty, and in-flight states across views
* improve dropdown and single-selection behavior
* add clipboard and credential-copy helpers
* persist table pagination and explorer search preferences
* improve error recovery when UI context providers are unavailable
* remove multiple panic-prone unwrap and browser API paths
* replace remaining hardcoded UI strings with translation keys
Maintenance:
* resolve backend and frontend compiler and Clippy warnings
* update packages and test fixtures
* consolidate duplicated helpers and validation logic
* improve documentation for configuration, filters, plans, DVR, and REST APIs
* add and update tests for migrations, filters, deduplication, sorting,
configuration, streaming, and accessibility behavior
