feat(Mountain): Add TLS infrastructure and land:// protocol support

This commit introduces a comprehensive TLS certificate management system and custom URI scheme handler for the Mountain backend, enabling secure local HTTPS services and webview isolation.

## New Components

### CertificateManager (TLS Infrastructure)
- Implements a complete PKI with root CA stored in OS keyring
- Generates ECDSA P-256 server certificates signed by the CA
- Supports automatic certificate renewal (30-day threshold)
- Uses `rcgen` for certificate generation, `x509-parser` for validation
- Integrates with `rustls` for TLS server configuration
- Provides `anyhow` for improved error handling

### ServiceRegistry
- Tracks mapping from `land://` domain names to local HTTP service ports
- Thread-safe using `Arc<RwLock<HashMap>>`
- Supports both HTTP and HTTPS service registration
- Provides health check functionality for registered services
- TLS certificates are provisioned on-demand via CertificateManager

### Scheme Handler (land:// protocol)
- Handles `land://` custom URI scheme for webview isolation
- Routes requests to local HTTP services via ServiceRegistry
- Implements CORS headers for cross-origin requests
- Provides static asset caching for performance
- Supports HTTP/HTTPS forwarding to local services

### DNS Integration (Mist)
- Starts Hickory DNS server on port 5380 (or fallback to random port)
- Registers DNS commands: `dns_get_server_info`, `dns_get_zone_info`, `dns_get_forward_allowlist`, `dns_get_health_status`, `dns_resolve`, `dns_test_resolution`, `dns_health_check`
- Provides DNS-based protocol resolution for land:// URIs

### Tauri Commands
- TLS: `tls_initialize`, `tls_get_ca_cert`, `tls_get_server_cert_info`, `tls_renew_certificate`, `tls_get_all_certs`, `tls_check_cert_status`
- DNS: Commands registered in Entry.rs for webview access

## Configuration Updates
- tauri.conf.json: Updated CSP to allow `land:` protocol in connect-src, default-src, font-src, img-src
- Cargo.toml: Changed binary path, added dev-dependencies and TLS/rustls dependencies
- Entry.rs: Initializes ServiceRegistry, DNS server, and scheme handler in setup hook

## Tests Added
- `tests/certificate_tests.rs`: Integration tests for CertificateManager
- `tests/service_registry_tests.rs`: Service registration and health check tests

This infrastructure enables the Land architecture to securely serve HTTPS to the webview while maintaining isolation through the `land://` custom protocol scheme.

Author: NikolaRHristov

Cargo.toml

@@ -1,6 +1,6 @@
 [[bin]]
 name = "Mountain"
-path = "Source/Library.rs"
+path = "Source/main.rs"
 
 [build-dependencies]
 json5 = { workspace = true }
@@ -12,6 +12,10 @@ toml = { workspace = true }
 tonic-build = { workspace = true, features = ["transport"] }
 tonic-prost-build = { workspace = true }
 
+[dev-dependencies]
+tokio-test = { workspace = true }
+futures = { workspace = true }
+
 [dependencies]
 tauri = { workspace = true, features = [
 	"compression",
@@ -28,13 +32,15 @@ tauri-plugin-localhost = { workspace = true }
 tauri-plugin-log = { workspace = true }
 
 async-trait = { workspace = true }
+anyhow = { workspace = true }  # TODO: Added for error handling in CertificateManager
 base64 = { workspace = true }
 chrono = { workspace = true, features = ["serde"] }
 colored = { workspace = true }
 Common = { workspace = true }
 dirs = { workspace = true }
 Echo = { workspace = true }
 Air = { workspace = true, optional = true }
+Mist = { workspace = true }
 env_logger = { workspace = true }
 futures-util = { workspace = true, features = ["sink", "std"] }
 globset = { workspace = true }
@@ -61,6 +67,12 @@ thiserror = { workspace = true }
 tokio = { workspace = true, features = ["full"] }
 tokio-tungstenite = { workspace = true, features = ["rustls-tls-native-roots"] }
 tokio-util = { workspace = true, features = ["full"] }
+pem = { workspace = true }
+rcgen = { workspace = true }
+p256 = { workspace = true }
+x509-parser = { workspace = true }
+rustls-pki-types = { workspace = true }
+rustls = { workspace = true }  # TODO: Added for TLS configuration in CertificateManager
 toml = { workspace = true }
 tonic = { workspace = true }
 tonic-prost = { workspace = true }