improve performance of route generation (#914)

this may fix following problem:

1. cpu 100% when large number of nodes in network.
2. high cpu usage when large number of foreign networks.
3. packet loss when new node enters/exits.
4. old routes not cleand and show as an obloleted entry.

Cargo.lock

@@ -1950,6 +1950,7 @@ dependencies = [
  "gethostname 0.5.0",
  "git-version",
  "globwalk",
+ "hashbrown 0.15.3",
  "hickory-client",
  "hickory-proto",
  "hickory-resolver",
@@ -3075,9 +3076,9 @@ dependencies = [
 
 [[package]]
 name = "hashbrown"
-version = "0.15.2"
+version = "0.15.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bf151400ff0baff5465007dd2f3e717f3fe502074ca563069ce3a6629d07b289"
+checksum = "84b26c544d002229e640969970a2e74021aadf6e2f96372b9c58eff97de08eb3"
 dependencies = [
  "allocator-api2",
  "equivalent",
@@ -3681,7 +3682,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c9c992b02b5b4c94ea26e32fe5bccb7aa7d9f390ab5c1221ff895bc7ea8b652"
 dependencies = [
  "equivalent",
- "hashbrown 0.15.2",
+ "hashbrown 0.15.3",
  "serde",
 ]
 
@@ -4788,7 +4789,7 @@ version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "af1844ef2428cc3e1cb900be36181049ef3d3193c63e43026cfe202983b27a56"
 dependencies = [
- "proc-macro-crate 2.0.0",
+ "proc-macro-crate 3.2.0",
  "proc-macro2",
  "quote",
  "syn 2.0.87",
@@ -5362,7 +5363,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a98c6720655620a521dcc722d0ad66cd8afd5d86e34a89ef691c50b7b24de06"
 dependencies = [
  "fixedbitset 0.5.7",
- "hashbrown 0.15.2",
+ "hashbrown 0.15.3",
  "indexmap 2.7.1",
  "serde",
 ]