headscale: add OIDC login, stop overriding clients' local DNS

Two changes to the control server, plus the fallout on the hosts.

OIDC via Authentik, so `tailscale up --login-server ...` opens a browser
instead of needing a pre-auth key. This is a second Authentik application,
separate from headplane's, with headscale's own /oidc/callback redirect.
Headless hosts keep using pre-auth keys. Note that headscale runs OIDC
discovery at startup and a failure is FATAL -- pointing `issuer` at an
application that does not exist yet means the control server will not
boot, so verify the discovery document before deploying.

override_local_dns = false, because the upstream default of true replaces
resolv.conf with 100.100.100.100 on every node. That silently broke the
LAN's `.sol` names -- pihole serves those and the global nameservers
return NXDOMAIN for them -- and took ad blocking down with them. It also
made each node's entire DNS depend on tailscaled, which is what had
forced --accept-dns=false onto neptun and mercury individually; both of
those workarounds are now removed, and with MagicDNS resolving properly
again neptun no longer needs its hardcoded /etc/hosts pin for jupiter.

Also serves jellyfin and seerr from jupiter, matching the ports they
already use on its LAN vhosts, and rotates the tailnet pre-auth keys.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

secrets/jupiter.yaml

@@ -1,6 +1,6 @@
 samba_password: ENC[AES256_GCM,data:K3FtKC0CrOLMyfQokmxxlyUnDPo=,iv:9bTE/S/i05LJYldOHuBuz3+g8JdTuq0ysFFgXOmfti8=,tag:77NIxy7qpHRqCmbOR83AfA==,type:str]
 darman_password: ENC[AES256_GCM,data:DOHHlM4Qdw4WgkN+/M51n2LMjJqq5MS0FeGEH8Pz3297yUZ8jBDOKRS/Tek9stC05JKEQRtn/vVVbAY0nXs20MwrsDMo+IEFXx7Ms90vVyYIYe5O5/0aQkPq84vcwGN0RW1Rj5Y3s38vWA==,iv:DAqHbvOBq7FT7ALbmBXJ0HadEGEsL8V2e7R99H5ZH0s=,tag:9XpiRFIbaZjMn59uHCOA1g==,type:str]
-tailscale_authkey: ENC[AES256_GCM,data:LjRXyFW1SbhUiXbCQnRKinJluGfQWsjS7TTP/TMvx2noP6aFNrcYMvitG+OqLAlNEQAy0bcxZejZgJN+yNS+5iuy2F7OXhrpO7Df0JHkyMvQpnaH2XBEsw==,iv:QxVkB6GtZOYWFAOFVdBQMU2Hb/2OwBRCLHdfxoDF/ME=,tag:PBL0TV6yZJSu4+TGpycf/A==,type:str]
+tailscale_authkey: ENC[AES256_GCM,data:dwBoHIJNcRSLxk1rbMsrEHVoYdxdnvYpPq44utfQ8t4XkXEzto96FEctv/QuPYVGgUxdyPczmc0/97m4AAKjaBVGFXpt/XlnFQI2XgzgSJ0qhNWyfJ1F/g==,iv:1b9nMeeZwr4O8cKjxQ0f+j/yxMUBZpicmdXw7bb9hZk=,tag:FWgrKtKgqailQk+BcZNXhw==,type:str]
 mediamanager_token_secret: ENC[AES256_GCM,data:g75vj1E6B029O076yV3DS/1z99Tq6wMhEVx+ULYDjHsplyA+vqVRvBlviC64V47IMqKd9k2eTGBJ98Ptv3UIjbr446xZinz0c7PZgHU0XOX4EUcB1ORloMFZIv1zUv8VRjUISUQnn/vRk60e7u8eXrOrgXjxfnoBKrdKZmqxhAM=,iv:2t0XBExC9RvbTomezka+99/LtJl64zNwneA7WWc4ju0=,tag:SVCYuw0n6JevnvoQOIkjPw==,type:str]
 sabnzbd_api_key: ENC[AES256_GCM,data:6UW1u2Ikmnq34t4H4k/4C44SJeFHRlaPjWwUjEfH1GQ=,iv:sGsd8Sd2pfUhTUDg6PlRzfVYejRbF69jmDTIa2fvY4M=,tag:3fOLgU1K1gKHxQ3J1+3oRQ==,type:str]
 prowlarr_api_key: ENC[AES256_GCM,data:ab1QACaagI8ACJXFUy8r9X9lgYwRo1byUmhBPSRWwKk=,iv:EcuF6EN/4mWxlXi6R1qDzv4rOw6AT+OGSNQaaBwjJHg=,tag:hixHrbQWU6QQZNMM5rNDsg==,type:str]
@@ -25,7 +25,7 @@ sops:
             CzjSDQZTcseEXZNwuzZcfB5Mvq0BQvjOj7lGuxzuE4qwWkdJWGfVLQ==
             -----END AGE ENCRYPTED FILE-----
           recipient: age1zak7glavmg4026p2389fyqe769vqm4jrryknuqckgqq4merz5f7q44rkkt
-    lastmodified: "2026-07-20T07:51:55Z"
-    mac: ENC[AES256_GCM,data:CBQrHpdIOn35CIrZaqZqZd/V4pp+bMNygXJoYwlOvwAtb49ElqmQgSZxWVgTKpTNZpMkqYie6HQB0c4vsmU/BYeLQKJNYBQvBxIrTQr4wMURj2jBMhtVT2osX5cUpNakoHZUdz6ARXyYGEVOBzMY77vSxk6VkVi5CFmeOETkcik=,iv:a6iTeIlR2S65pTrH+juS6kEhpbiaAmhcPLssasUPZ58=,tag:QP+LMclWU9SO5/uPI/Nwwg==,type:str]
+    lastmodified: "2026-07-20T18:42:14Z"
+    mac: ENC[AES256_GCM,data:l9O/KAd/5KfC+LXwE2y5+ybflyy9Xl0PikoRfcOzIFu+fVWESyi0D22emWen6J4mpvsXgjAp4GCu4RKNTGyy47mfkaHh/KdxozEOmP8VlKOJXtqzU9lTgZwhHqkF9RKsRLKHvmREugwzWnpplJ8J7bg5Z3llBIM36FlElzQ9hUw=,iv:x0lM9Ctcn1XCsXftB9Ze8WV8Rp4YA26MQ/AdGC78MyY=,tag:gtfaSDQAcAkngRw2Ph2N0A==,type:str]
     unencrypted_suffix: _unencrypted
     version: 3.13.1

secrets/mercury.yaml

@@ -1,6 +1,6 @@
 darman_password: ENC[AES256_GCM,data:iZQERcXtyH+91yUc3r7U6jnFYrGQPFeCPk/9ZDfxOhPLlGMX3/iEZ+SzZ7a7rDKUeUAaQUsrqANLDLclRYm4Ngo09EkbDxBx5x2GpQwlqSAS45LHnTen9LTzisWghdy79Xnilq322eaB3g==,iv:ozx/BPLR8nZTKHZroKrrh2z6ZlVCuLydQ3aNY4XvcIg=,tag:CSrq5ZipYxtXTT8RintuHQ==,type:str]
 pihole_webpassword: ENC[AES256_GCM,data:5iOTqD0CcbOCnM1b4+RbajMTyAU=,iv:2ZRW7dshnPzWkuudrn6n92y4Z2n/6fdnBB7BO5/ypS4=,tag:8UZSqJM6dVECQgrF6v5Fuw==,type:str]
-tailscale_authkey: ENC[AES256_GCM,data:CZe1wkh2DNF2g4wy30Wph0c4/3f1M2K9Up+3oAcLEVdZjJzLRJotAU/0Nw2PSGoDZTtqOSfDaEXsaa45DBIJj2EUvWKSYrkV4XkLCio6ZWoGhmxH9PYfkw==,iv:UqNZz7grRPT/d1a2Tv1PW4H2k5FeZCuDy/fK+jVou9E=,tag:cYbLk+7JqU/1by8j2ri0Xg==,type:str]
+tailscale_authkey: ENC[AES256_GCM,data:Ogm5RTcbJl5lsL19qgTcqXLWK7ypxXrAHNYgriduQQSSRoRWvsnJ3A2Lbynb+r756WxJyFSFqY3WGr9pHaCYo8LAf5oD1MJE26I7JtsAVcHY0QS29b2MnQ==,iv:3H0YMk6llOBapqtMkxsdlY8wQhzIXa+6W4ZrWD0iq2M=,tag:3rPQS7FX8ODLAQK5gOL7lw==,type:str]
 sops:
     age:
         - enc: |
@@ -21,7 +21,7 @@ sops:
             x6FfYadcRfqvSX60l6+TGdzq6xDpxLIZOJ8q19qZsAvB0in50HW5gg==
             -----END AGE ENCRYPTED FILE-----
           recipient: age1cpty7zrgnn6l97upq00w5wa8zcvnkxkdt2jvhlj97jh83exure4slha43t
-    lastmodified: "2026-07-20T08:31:19Z"
-    mac: ENC[AES256_GCM,data:kdWGhCOENvnUAnwbLW58JH8Ur+g+f4Z1pr3seZGGOFa04xeXb5HOzegpIH+x7OT5OvsKZsMKWf7sBGgB/nx+m2ZKy4NLC39dLbV8V5hs18NhRKl5vKZBZHE1D2xAK4+REwRYT6LiXArQssPv9e2q5fcW6q3rtnlHMF0tUsWip9o=,iv:BkKv2ZBxZMX4agHTzF2Mcmasxpp+hqkiu9mH0mUeLS4=,tag:t0MeKRPikYR5MAmU8r77sg==,type:str]
+    lastmodified: "2026-07-20T18:41:59Z"
+    mac: ENC[AES256_GCM,data:Ay3JLVmJu9S5wlxyL5mrACgLv+jbAsKB5/5r8/z5m4fPjfaYnBQbn1b2s8G764yI0+L3JVWyAdvdy2Gqplrds87lWqlf+gpJKGOoargsiIZAfJmJEzZOYZLPT8YanvGMHniAJszeZ9CnL7Uf9fn0RpT4ObeT7didSqIds6xVeRs=,iv:whZ9L1+tMTkTZaVUdshghIsS9Gmde4RozMDe3XN1ek8=,tag:015mccmr9A/YW+7E+1CsGg==,type:str]
     unencrypted_suffix: _unencrypted
     version: 3.13.1

secrets/neptun.yaml

@@ -2,10 +2,11 @@ darman_password: ENC[AES256_GCM,data:7G2Hgh13TxI6ugw2ebp9UtLTQ7HRC/hrCga0FmZo8h8
 authentik_secret_key: ENC[AES256_GCM,data:qLrAWBywlMqT6D3FYDqE9I/5Ep+zDVu9ns9TA4UVOBSQ1uFGEj01TU9norqPf12pi9/Qs32mVzm5BqDG259DxdGT9DZVQc03QVwiIQYtmWo=,iv:OVCIxIP1Xv+nHmYsrxaPgYWQiwzVPUe8pnbyMBVAuoI=,tag:+ywkwPqkY1Dkx1R5cUJ7PA==,type:str]
 authentik_bootstrap_email: ENC[AES256_GCM,data:OmqpKAiiFyS/rytnHYRZ,iv:VXiPV5VfduC/IW+E3gDlNAeE+hr+IZ9W7Ty6Npuu59Y=,tag:rjvTHnBxN/pMvpQC5W9S6Q==,type:str]
 authentik_bootstrap_password: ENC[AES256_GCM,data:QPCY0ni3jBQY5HyK+vRlyT4YTEo=,iv:41u1Jf+WYksPUY4pvKdHQA1RHW21GAfdVDRuQ7XtdYc=,tag:SYmzv26GbE1kwleXyKLG4Q==,type:str]
-tailscale_authkey: ENC[AES256_GCM,data:t8oKG+oSZrGF1Xb2YX7qWxo/z/dfsq/56kah/cvIdfQihuOSWNuMEWDcph1wlRCgRmNhQE8oqbO61m8xNQuOn+bNHsAEmh9GO9dt+uFuRKdwXJ2vM0nA+Q==,iv:6aq6buNvJ+Y0AUWBLNCdsl+svGGlXzpn5J3Oy7dPDys=,tag:T/lwzHUtyvcbjbKbu6jWeA==,type:str]
+tailscale_authkey: ENC[AES256_GCM,data:0Rkz9igafuEwHFDNqCaT6bVgL4pF7uyW4PKqimONMfZy4zrrHBO9SFedyrOjmByZxQjmHsb9VmBiHsrStPVnPmMRqZJG5lyuiWjorHcyoG+NxpAo6Az87Q==,iv:UnSWVQOFc/nEbJs5s4rF+F9XYRY0VVpIxoMp+VqKh/o=,tag:Gv6f+s+zwY2jU7NZUx0rrA==,type:str]
 headplane_cookie_secret: ENC[AES256_GCM,data:oXYRG4z16u6HS7zXoWrV2q/HL2o24n4UwVXnQvqBmbY=,iv:itAiy/w6ue4VzqO5xYnvSYN3uCLLmu52dvAAxZ2pCGc=,tag:MEFP171GpSQpAqUFsWY+VA==,type:str]
 headplane_oidc_client_secret: ENC[AES256_GCM,data:RiEESz1WHYH/smlJKmKFpPoF5HRYp8gHJoKqc49xRRuU9WnQCnmETie/68u37sSVniQmQZSOmXxdmvuuJgP5LMcPdkrQmQE+QX80RQhtTVvg2AhqRaK4V+qfQleD/aJjoIHojeM3UBUi4kYOhDJF0FFTP+qR4oitH6W8/2jxRsc=,iv:hXquOglPhRv+QTVRw5fkY7BWuwLtJxK5tNERGBOOmt8=,tag:2KczveRWoq7iTOdwjO+AUw==,type:str]
 headplane_headscale_api_key: ENC[AES256_GCM,data:KcwcprV100wfAkn+YM4+1oTfXkmyeAMAbXNpQKf2iIq0VxwqVep+fORrKmHiwDViciDoyxdMiT4scGlmd4vQRsWEHdDpkuH7MRHYu0hQepE3rSSQAMbK,iv:NEhmi2hiOE+uSIRZ4uXOK1UGpN+FQx/NpooWzTgwik8=,tag:KcPsD4gp51ERaFwgfA0BrQ==,type:str]
+headscale_oidc_client_secret: ENC[AES256_GCM,data:262lZGgtmuXTuk3He1WyqyjcXrdnIiwNyWlXEYCGKYbKkWe0JPbUdWcwGVlZ+wXt71pzKuRDpZjgdibVTWYd71mohD/Ni6CwJm7dhf517DqznnYrxojZaSxRYXg/sCVSkwEvVseJ5z2yf/Led1VLNd3I1PaUIlwkdm2P91ps7mM=,iv:w/hu7siWwNAIw7g14bake5BP8ouA/b1SZdeukZXa/dw=,tag:vAXqWfSHwIdGAjR78gSpRg==,type:str]
 caddy_acme_email: ENC[AES256_GCM,data:j+iPz4lt0Gqs2SKHTS53,iv:DQNfcpYy2v93sKeCvXzLOoBhAo0PjZrxHgFD1oVqYu8=,tag:1yPH/2cW/IiRi9lT8dELEg==,type:str]
 sops:
     age:
@@ -27,7 +28,7 @@ sops:
             Wptkf76aP9UpjhgNkxzedRebQPB7ti+UiVqCvLVimtuHcsm/NJPcRg==
             -----END AGE ENCRYPTED FILE-----
           recipient: age1hp72xyx2cnd05937e4eww95g5kdtn0wsf9j2nypw330pa69gfdxqn0lpkp
-    lastmodified: "2026-07-20T08:15:48Z"
-    mac: ENC[AES256_GCM,data:yDiCTDaIwMCXZfzE4khI7AHNoYi3AHFX+nSXtioNRqLEOu1fBCA3OqHpzTi4Cskv2o7r9nlxx5AGPM+2d3bSHkXW7SJk680IMA/XzfDIKGU6A7+3NDt14/PgxOvPeVTfNWwlWIW9tXPtTVJmnoItTzPsxcLO3OyfbbO+vZhj/j4=,iv:xeqYTLjG0B6yCWoke0lulHetVNlShmw7Nm+8mmwOZ5I=,tag:JUEqRfEprzGMGoGsXp9rKQ==,type:str]
+    lastmodified: "2026-07-20T18:41:45Z"
+    mac: ENC[AES256_GCM,data:Ie+xvOMKI4ARsYEvKc9iKuCahNQWWmjHQ56NpGsPbYF7XMv2HoOor/Nj7VJNhUD8DnoSq5A67qglfmTSk+KB65yMVSeDYJam5hwUzuo+IB9fHC1sWPNiWCVuG1iKh7ruiTaW/r3uA59+vQ2Ww5fFM/tTIuR1wtYtzVJ+5GKB/fA=,iv:5oYnhxlRfUDaxgR0FXPwE1eBrpqh/1eRWKTG8B+BgmQ=,tag:28Kxp4lp6F/mxTNXCCW8ZQ==,type:str]
     unencrypted_suffix: _unencrypted
     version: 3.13.1